Pratt & Whitney PW1000G
The Pratt & Whitney PW1000G is a high-bypass geared turbofan engine family, currently selected as the exclusive engine for the Airbus A220, Mitsubishi SpaceJet, and Embraer's second generation E-Jets, and as an option on the Irkut MC-21 and Airbus A320neo. The project was previously known as the Geared Turbofan (GTF), and originally the Advanced Technology Fan Integrator (ATFI). The engine is expected to deliver reductions in fuel use and ground noise when used in next-generation aircraft. The PW1000G engine first entered commercial use in January 2016 with Lufthansa's first commercial Airbus A320neo flight.
|National origin||United States|
|Manufacturer||Pratt & Whitney|
|First run||November 2007|
|Major applications||Airbus A220 |
Airbus A320neo family
Embraer E-Jets E2
|Program cost||$10 billion|
|Unit cost||$12 million|
In summer 1993 Pratt & Whitney started to test its 53,000 lbf (240 kN) Advanced Ducted Propulsor (ADP) demonstrator at the NASA Ames wind tunnel, using a 4:1, 40,000 hp (30,000 kW) gearbox. Its 118.2 in (300 cm) fan with 18 reversing pitch composite blades had a 15:1 bypass ratio. It aimed to cut fuel consumption by 6–7%, emissions by 15%, and generate less noise due to lower fan tip speed of 950 ft/s (290 m/s), down from 1,400 ft/s (430 m/s) in conventional 5:1 bypass turbofans. While the gearbox and larger fan weighed more, this was mitigated by using 40% composites by weight, up from 15%. In 1994 P&W was planning to run a 60,000 hp (45,000 kW) gearbox for 75,000 lbf (330 kN) of thrust.
P&W first attempted to build a production geared turbofan starting around 1998, with the PW8000, targeted for the 25,000–35,000 lbf (110–160 kN) range. This was an upgrade of the existing PW6000 that replaced the fan section with a gear box and a new single-stage fan, and aimed for 8–10% lower operating costs, or $600,000 per aircraft annually.
The PW8000 had an 11:1 bypass ratio (twice that of the V2500), a 40:1 overall pressure ratio, and 13 compressor stages instead of the 22 in the V2500 for similar thrusts. Preliminary development was to end by June 1, the first test for 10 months later, and certification 20 months after, for $400 million. Pratt had tested gearboxes for 950 hours for $350 million in the previous decade and aimed for 99.5% efficiency. The ADP gearbox was 30% more powerful and the reversing pitch fan was not retained for the PW8000. Pratt was to control 60% of the program, shared with IAE partners MTU and FiatAvio but not Rolls-Royce, and possibly with Volvo and MHI.
Its LP turbine ran at 9,160 rpm, reduced by 3:1 for a 3,250 rpm fan having a 1,050 ft/s (320 m/s) blade tip speed down from 1,400 ft/s (430 m/s), dropping noise to 30 EPNdB cumulated below Stage 3 requirements. The 76–79 in (190–200 cm) fan had 20 titanium blades, and moved 1,369 lb (621 kg) of air per second in climb. The conventional 3-stage LP compressor was followed by a 5-stage, 12:1 HP compressor fitted with 700 blades inspired by the military ATEGG program's low aspect-ratio airfoils. A floatwall/TALON combustor was followed by a single stage HP turbine and a counter rotating 3-stage LP turbine with 400 blades, both CFD optimized. The gearbox could handle 50 hp/lb (82 kW/kg). Eight engines would have been used for certification.
After several years, the PW8000 project was abandoned.
Soon afterwards the ATFI project appeared, using a PW308 core but with a new gearbox and a single-stage fan. It had its first run on March 16, 2001. This led to the Geared Turbofan (GTF) program, which was based around a newly designed core jointly developed with German MTU Aero Engines.
In addition to the geared turbofan, the initial designs included a variable-area fan nozzle (VAFN), which allows improvements in propulsive efficiency across a range of the flight envelope. However, the VAFN has since been dropped from production designs due to high system weight.
In July 2008, the GTF was renamed PW1000G, the first in a new line of "PurePower" engines. Pratt & Whitney claims the PW1000G is 16% more fuel efficient than current engines used on regional jets and single-aisle jets, as well as being up to 75% quieter.
The engine was first tested on the Pratt & Whitney Boeing 747SP on July 11, 2008 through mid-August 2008, totaling 12 flights and 43.5 flight hours. It then flew starting October 14, 2008 on an Airbus A340-600 in Toulouse on the number two pylon. Testing of the CSeries bound PW1524G model began in October 2010. The PW1500G engine successfully achieved Transport Canada type certification on February 20, 2013. The A320 engine, the PW1100G, had made its first static engine test run on November 1, 2012, and was first tested on the 747SP on May 15, 2013.
The first flight test on one of its intended production airframes, the Bombardier CSeries (Airbus A220), was on September 16, 2013. The first flight of the Airbus A320neo followed on September 25, 2014. The PW1100G engine successfully achieved FAA type certification on December 19, 2014. The fourth variant of the engine, the PW1900G, first flew on November 3, 2015 from Mirabel in Canada fitted to the Boeing 747SP test aircraft.
At the start of its production in 2016, each GTF was costing PW $10m to build, more than the sale price, but should become less than $2m per engine. MTU provides the first four stages of the high-pressure compressor, the low-pressure turbine and other components. In October 2016, MTU started to deliver the engine assembled on its line to Airbus.
In November 2016, Pratt had fixed the issue of engine start time and wanted to deliver 150 powerplants by the year-end, 50 fewer than originally planned. This was because of low yield of fan blades when less than one-third were passing inspection at the start of the year compared to 75% success for the latest. 350–400 engine deliveries were targeted for 2017. Fuel-burn performance was 16% better than the IAE V2500 baseline, on target, and even 18% better in best cases.
The troubled introduction led to customers choosing the CFM LEAP, which won 396 A320neo orders compared to 39 for the GTF from January through early August 2017: 46% of the GTF-powered A320neos were out of service for at least one week in July 2017 compared with just 9% of those using the LEAP. The GTF's market share fell from 45% to 40% in 2016, but 1,523 planes (29%) were still undecided, and as of August 2017 Pratt had an 8,000 engine orderbook including 1,000 non-Airbus planes.
On 24 October 2017, a 99.8% dispatch reliability was attained and Pratt remained on track to deliver 350 to 400 engines in 2017, as 254 have been delivered including 120 in the third quarter, but 12–15% were diverted for spares as the carbon air seal and combustor liners were wearing out quickly, requiring engine removals to change the part. P&W expects to deliver over 2,500 GTFs from 2018 to 2020, more than 10,000 engines by 2025.
After 15 PW1200Gs for the Mitsubishi MRJ development were built in Mirabel and Middletown, Mitsubishi Heavy Industries started final assembly in Nagoya in mid 2018 for the MRJ 2020 introduction. Icing, thermal environment, stall, drainage, performance, operability and other development tests were completed. MHI manufactures the combustor and high-pressure turbine disks. The first engine was completed by November 2019.
Ultra high-bypass versionEdit
In 2010, Pratt & Whitney launched the development of an ultra high-bypass version, with a ratio significantly higher than the PW1100G's 12.2:1 for the A320neo, to improve fuel consumption by 20% compared to a CFM56-7 and reduced noise relative to the FAA's Stage 4 by 25 dB. In 2012, wind tunnel tests were completed on an earlier version of the fan and in 2015, 275h of testing were completed on a fan rig. More than 175h of ground testing of key components were completed in October 2017, on a shorter duct inlet, a part of the nacelle and a fan with lower-pressure ratio blades, significantly fewer than the 20 blades of the PW1100G. The US FAA Continuous Lower Energy, Emissions and Noise (CLEEN) program sponsors the tests, with its technologies to be validated in a flight test campaign. It could power the Boeing New Midsize Airplane in the mid-2020s and Airbus' response, and would compete against the Rolls-Royce UltraFan and a CFM LEAP higher-thrust version.
By putting a 3:1 gearbox between the fan and the low-pressure spool, each spins at its optimal speed: 4,000–5,000 RPM for the fan and 12,000–15,000 RPM for the spool, the high-pressure spool spinning at more than 20,000 RPM. The 30,000-horsepower (22,000-kilowatt) gearbox is designed as a lifetime item with no scheduled maintenance other than changing oil. The A320 PW1100G fan has 20 blades, down from 36 in the CFM56-5B.
As the higher bypass ratio and gear leverage a higher propulsive efficiency, there is less need for a high performance engine core than the CFM LEAP, leaving a larger fuel burn gain margin of 5–7% over the next decade, averaging 1% per year combined with gear ratio tweaks. It has up to 25,000 cycles LLPs, 25% better than others at 20,000 cycles, reducing maintenance costs, and the fan gear has no limit.
The family of engines generates 15,000 to 33,000 lbf (67 to 147 kN) of thrust. It uses gearboxes rated between 16,000 hp (12,000 kW) and 32,000 hp (24,000 kW).
The first delivery to a commercial operator, an A320neo to Lufthansa, occurred on January 20, 2016. As of early August 2017, Pratt was supporting 75 aircraft: 59 Airbus A320neos with PW1100Gs and 16 Airbus A220s with PW1500Gs. In January 2018, it reached 500,000 flight hours on a fleet of 135 aircraft flown by 21 operators. Due to teething problems, overall losses on the GTF program rose to $1.2 billion.
In May 2018, after receiving and operating five A320neos, Spirit Airlines confirms a fuel burn reduction better than the 15% promised, perhaps by 1%–2%. Air Lease Corporation's A320neos deliveries are 11 months late but its executive chairman Steven Udvar-Hazy believes 12–18 months will be needed to get back to normal.
The first delivery was to Lufthansa instead of Qatar Airways due to rotor bow, or thermal bowing, due to asymmetrical cooling after shut-down on the previous flight. Differences in temperature across the shaft section supporting the rotor lead to different thermal deformation of the shaft material, causing the rotor axis to bend; this results in an offset between the center of gravity of the bowed rotor and the bearing axis, causing a slight imbalance and potentially reducing the tight clearance between the rotor blade tips and the compressor wall. All production standard engines now feature a damper on the third and fourth shaft bearings to help stiffen the shaft and data from engines in service and under accelerated testing is expected to gradually reduce engine start times. According to P&W President Bob Leduc, "by the time we get to June (2016), it will be down to 200 seconds for start time and by the time we get to December (2016) we will be down to 150 seconds for start time".
In an earnings briefing on 26 July the CEO of Pratt & Whitney's parent company United Technologies Gregory Hayes stated when asked about the start up issues on the PW1100G-JM; "On the technical stuff, I would tell you it is in the rearview mirror. The start time with the software drops have been pretty well addressed". Airbus group chief Tom Enders said while releasing Airbus's 2016 first half financial results that the first upgraded "golden engine" would be delivered to Lufthansa in early August 2016.
Initially, the PW1000G start up sequence took about seven minutes, compared to one to two and a half minute startups on the similar CFM56 and IAE V2500 engines; hardware fixes and software upgrades decreased the time required by a little over a minute, and cooling down both engines at the same time saved slightly over two minutes, for a total reduction of three and a half minutes. These modifications were included on new-build engines, as well as retrofitting existing units. Pratt & Whitney continued to improve start up times, with fuel-nozzle modifications and oil filling procedure changes expected to save another minute when introduced by the end of 2017.
To create a better seal and reduce cooling time by 1 min, a cubic boron nitride coating was applied to the 11 integrally bladed rotors tips: the A321neo production engines start times will be similar to the V2500.
As IndiGo and Go Air operate in a humid, hot, polluted and salty environment, 42 engines were prematurely removed from those companies' aircraft by 24 February, with more removals scheduled, after warnings, mandatory checks, and possible repairs were due after only three flight hours instead of ten. 28 engine removals were due to an air seal leakage in the third bearing, which allowed metal particles to enter the oil system, triggering detectors. Pratt & Whitney discovered these issues in 2015 and revised the design in 2016 after the 160th engine with improved bearing compartments and damping for the third and fourth bearings to offset the rotor-bow, with the repairs retrofitted on-wing after testing at Airbus and Pratt. Boosting durability of the third bearing compartment air seal, the upgraded carbon seal package was certified on April 12 and can be retrofited over a typical night stop.
Thirteen engine removals were due to borescope inspections revealing blocked cooling holes in combustion chamber panels, apparently due to saltier air, and Pratt & Whitney developed and tested a more durable combustor design to address a tone problem, to be introduced in September.Spirit Airlines reported that the bleed air system froze shut on occasion due to cold temperatures on four of its five A320neos, a problem also experienced by IndiGo, leading Spirit to impose a 30,000 feet (9,100 m) ceiling on their aircraft. To avoid troubles with the P&W1100G engines, JetBlue Airways switched its first three Airbus A321neos in 2018 to A321ceos, deferring delivery of its first A321neos to 2019 among its order for 60.
In 2017, IndiGo had to ground seven planes, two in May, four in June and one in July after, their engines out of service, waiting for upgrades: a lack of spare parts—grounding also All Nippon Airways and Hong Kong Express Airways A320s—has been compounded by a new Indian tax on goods and services impeding imports. With removals without sufficient spare engines available, the airline had to ground as many as nine jets on some days, operations disruptions are understood by Pratt & Whitney which struggles to fix glitches and sent compensation while design changes could take a year and sorting out the issue one and a half years. Indigo had to replace 69 engines from mid 2016 till early 2018.
Knife edge sealEdit
In February 2018, after in-flight failures of PW1100G with its high pressure compressor aft hub modified – apparently problems of its knife edge seal, the EASA and Airbus grounded some A320neo family aircraft until they are fitted with spares. Later, Airbus decided to stop accepting additional PW1100G engines for A320neo aircraft. Despite the part failure that could hold up engine deliveries to Airbus until April, P&W reaffirmed its 2018 delivery goal of doubling its 2017 rate of 374 engines as nearly 100 engines delivered to Airbus are problematic, including 43 in service.
To solve the issue, a revised configuration with a mature and approved design will be released from early March engine deliveries. The EASA and FAA imposed flying A320neos with mixed engines and forbid ETOPS, but the Indian DGCA went further and grounded all A320neo with an affected engine. The design flaw will cost Pratt & Whitney $50 million to resolve. P&W will replace the seals in the 55 engines delivered to Airbus and in the 43 in-service GTFs, as the target of 750 deliveries in 2018 seems more remote.
By September 2018, the A320neo's PW1100Gs were experiencing increasing engine vibrations, sometimes before 1,000 flight hours and mostly at high power settings in the climb phase, requiring an early engine change. Lufthansa's A320neos were grounded 254 days since first delivery, 13 times worse than for its A320ceos, 78% of the time due to engine issues as 14 unplanned engine changes were made. In September 2018 its A320neos utilization was half of its A320ceos. By the end of November, Airbus planned to explain the root cause and give an in-depth analysis by the end of 2018. Pratt & Whitney stated the A220's and Embraer E2's PW1500G/PW1900Gs are free from the issue and that less than 2% of PW1100Gs are affected while 182 GTF-powered A320/A321neos have been delivered.
By October 2018 about 10 P&W-powered A320neos were typically grounded for repairs at any given time. On 21 January 2019 an IndiGo flight returned to the airport shortly after takeoff after the pilot observed high vibration in one of its PW1100G-JM engines.[importance?]
Pratt & Whitney has reduced life limits on PW1500G (installed on the Airbus A220) and PW1900G (installed on Embraer E190/E195-E20) high-pressure compressor front hubs after corrosion was discovered during routine engine overhaul. This corrosion reduces the low-cycle fatigue capability and may lead to cracking before the component reaches its life limit.
Indian airline IndiGo reported four incidents involving in-flight engine stall during climb followed by shutdown, which occurred on the 24th, 25th and 26 October 2019. The cause of the shutdowns has been traced to problems with the Low-Pressure Turbine (LPT). On 1 November 2019 the Indian Directorate General of Civil Aviation (DGCA) asked IndiGo to replace engines on all of the 98 A320 Neo airplanes it currently operates by January 31, 2020 and suggested to defer future deliveries until the existing fleet is re-engined. Later DGCA extended the deadline to May 31, 2020.
This section may be too long to read and navigate comfortably. (November 2019)
On 25 July 2019, an Airbus A220-300 of Swiss International Air Lines had an engine inflight shutdown (IFSD) and diverted to Paris–Charles de Gaulle. The low-pressure compressor of its PW1500G disintegrated while climbing through 32,000 ft.
On 16 September 2019, a similar accident happened just before reaching 35,000 ft and the crew returned to Geneva. The inspection has shown that "stage-one rotor in the low-pressure compressor had separated and there was a hole in the compressor case". On September 26, 2019 the FAA issued an Airworthiness Directive mandating borescope inspections on the engines.
On 15 October 2019, another engine failed and the crew diverted to Paris-Charles de Gaulle, Swiss withdrew its fleet for inspection. Swiss returned some aircraft to flight status the same day after engine checks and planned to restore flight operations by 17 October. A software update may cause damaging vibrations of fast-moving parts, causing the failures.
After those engine failures, Transport Canada issued an emergency airworthiness directive limiting the power to 94% of N1 above 29,000 ft (8,800 m), disengaging the autothrottle for the climb over this altitude before engaging it again in cruise. For the PW1500G, N1 is the Low Pressure Spool, with a nominal speed of 10,600 RPM, with the fan geared with a ratio of 1:3.0625 (nominal speed 3461 RPM). The top of climb is the most demanding point aerodynamically for a turbofan, where the compressor spins the fastest. The directive states that "high altitude climbs at higher thrust settings for engines with certain thrust ratings" may be a contributor to the failures, and cautions that "this condition, if not corrected, could lead to an uncontained failure of the engine and damage to the aeroplane". The EASA adopted the directive, and others are expected to follow.
The engines involved in the July and September incidents had 154 and 230 cycles, respectively, while the October failure occurred to an engine with 1,654 cycles since new but within 300 cycles after an electronic engine-control update. Pratt & Whitney recommends inspections on engines with up to 300 cycles after the update.
Another PW1500G suffered an uncontained engine failure, on 12 February 2020 aboard A220-300 belonging to Air Baltic during flight BT-677 from Riga, Latvia to Malaga, Spain 
- Airbus A320neo: PW1100G
- Irkut MC-21: PW1400G
- Airbus A220: PW1500G (exclusive)
- Embraer E-Jet E2 family : PW1700G & PW1900G  (exclusive)
- Mitsubishi Regional Jet: PW1200G (exclusive)
|Fan Diameter||81 in (206 cm), 20 blades||73 in (185 cm), 18 blades||56 in (142 cm), 18 blades|
|Static Thrust||24,000–35,000 lbf
|Compressor||Axial flow, 1 geared fan, 3 stage LPC, 8 stage HPC||same except 2 stage LPC|
|Combustor||Talon-X Lean-Burn Combustor|
|Turbine||Axial flow, 2-stage HP, 3-stage LP|
|Application||A320neo family||Irkut MC-21||A220 family||E-Jet E2 190/195||E-Jet E2 175||SpaceJet M90/M100|
|Service entry||25 January 2016||2021||15 July 2016||24 April 2018||2021||2021|
|Type Certificate Data sheet|
|Length[a]||133.898 in / 3.401 m||125.4 in / 3.184 m||113.5 in (2.88 m)|
|fan case diameter||87.566 in / 2.224 m||79.0 in / 2.006 m||62 in (1.57 m)|
|weight||6300 lb / 2857.6 kg||4800 lb / 2177 kg||3,800 lb (1,724 kg)|
|Takeoff thrust||30/33G: 33,110 lbf / 147.28 kN
27G: 27,075 lbf / 120.43 kN
24/22G: 24,240 lbf / 107.82 kN
|19G: 19,775 lbf / 87.96 kN
21G: 21,970 lbf / 97.73 kN
24/25G: 24,400 lbf / 108.54 kN
|19G: 20,860 lbf / 92.79 kN
21G: 22,550 lbf / 100.31 kN
22/23G: 23,815 lbf / 105.93 kN
|Thrust-to-weight ratio||3.85 – 5.26||5.01||4.12 – 5.08||4.35 – 4.96||5.05|
- CFM International LEAP
- under development
- geared turbofan
- fan spinner face to aft flange
- Guy Norris (Jun 2, 2017). "Boeing's NMA Poses Propulsion Puzzle For Engine Makers". Aviation Week & Space Technology.
- "JetBlue Picks Pratt Over CFM for Engines Valued at $1.03 Billion". Bloomberg. December 15, 2011.
- Spaeth, Andreas (25 January 2016). "Onboard Lufthansa's First Airbus A320neo Flight – Airways Magazine".
- "Pratt & Whitney starts new ADP test phase". Aviation Week. July 26, 1993. p. 40.
- Bill Sweetman and Oliver Sutton (June 1, 1998). "Pratt & Whitney's surprise leap". Interavia Business & Technology. Highbeam Research. Archived from the original on October 19, 2012.
- "Pratt & Whitney's next leap in engine technology". Aerospace Engineering Magazine Online. SAE International. 1998. Top 15 Technology Innovations. Archived from the original on 2011-11-29.
- "Products". International Aero Engines.
- "Pratt & Whitney Launches Geared Turbofan Engine". Aviation Week. Feb 23, 1998. p. 32.
- "Geared-turbofan engine design targets cost, complexity". Aviation Week. Feb 23, 1998. p. 34.
- Robert Luedeman (April 17, 2006). "The Short Life and Untimely Demise of the PW8000". The Dougloid Papers.[self-published source?]
- "P&W readies for CSeries "third knob" engine testing". Flight Global. 23 February 2011.
- "Pratt & Whitney Begins Ground Testing on Geared Turbofan Demonstrator Engine Ahead of Schedule; Targeting 12%+ Improvements in Fuel Burn" (Press release). November 15, 2007 – via Green Car Congress.
- "Farnborough '08: Pratt & Whitney Launches PurePower Engine Family". Aero-News Network. Jul 14, 2008.
- Peter Coy (October 15, 2015). "The Little Gear That Could Reshape the Jet Engine". Bloomberg.
- Ostrower, Jon (August 19, 2008). "P&W completes GTF tests on 747SP, readies for A340 trial". Flight International.
- "Airbus-owned A340 flies P&W geared turbofan engine". Flight Global. October 14, 2008.
- "Pratt & Whitney geared PW1524G testing underway". Flight Global. October 30, 2010.
- "Transport Canada Certifies Pratt & Whitney PurePower® PW1500G Engine for Bombardier CSeries Aircraft" (Press release). Bombardier. February 13, 2013.
- "PurePower® PW1100G-JM Engine" (PDF) (Press release). Pratt and Whitney. May 15, 2017.
- "IN FOCUS: Pratt completes first flight of PW1100G engine". Flight Global. 3 June 2013.
- "Bombardier's CSeries Aircraft Completes Historic First Flight" (Press release). Bombardier. September 16, 2013.
- "A320neo Completes First Flight". Aviation Week. Sep 25, 2014.
- "FAA Certifies PurePower® Engine for A320neo Aircraft" (Press release). Pratt & Whitney. December 19, 2014. Archived from the original on January 10, 2015. Retrieved January 10, 2015.
- "P&W launches engine flight test campaign for new Embraer jets". Flight International. 3 November 2015. p. 12.
- "Pontifications: GTF faces steep learning curve on costs". Leeham News. June 13, 2016.
- "MTU formally opens A320neo engine line". Flight Global. 21 October 2016.
- Guy Norris (Nov 28, 2016). "Pratt Sees Busy Year-End As It Targets GTF Catch-Up". Aviation Week & Space Technology.
- Rick Clough (22 Aug 2017). "Pratt's $10 Billion Jet Engine Lags GE by 10-to-1 on New Orders". Bloomberg.
- Stephen Trimble (24 Oct 2017). "P&W speeds up GTF deliveries, but considers new design changes". Flightglobal.
- Chris Kjelgaard (March 16, 2018). "Pratt & Whitney Details GTF Recovery Schedule". AIN.
- Mavis Toh (3 July 2018). "apanese assembly of PW1200G underway in Nagoya". Flightglobal.
- Alfred Chua (13 Nov 2019). "MHIAEL ships first Japan-made PW1200G engine". Flightglobal.
- Stephen Trimble (13 Oct 2017). "New tests move P&W closer to ultra-high bypass GTF". Flightglobal.
- "Bjorn's Corner: Engine architectures". Leeham News. 4 March 2016.
- Tim Wuerfel (May 26, 2017). "Flying The A321neo: Technology Upgrades Under The Skin". Aviation Week & Space Technology.
- Ernest S. Arvai (May 31, 2017). "An Update: GTF Engine from Pratt & Whitney". AirInsight.[permanent dead link]
- Bernie Baldwin (Sep 7, 2018). "Profitability Is Aim Of Crossover Jets' Better Maintainability". Aviation Week & Space Technology.
- Button, Keith (October 2018). "High gear". Aerospace America. pp. 22–29.
- Fomin, Andrey (December 2011). "PD-14: New generation engine for MC-21". Take-off. pp. 20–21.
- "Airbus Delivers A320neo to Lufthansa". Wall street journal. January 20, 2016.
- Sean Broderick (Aug 31, 2017). "Issues With Newest Engines Provide Early MRO-Proving Opportunities". Aviation Week Network.
- Joe Anselmo (Jan 11, 2018). "GTF Reaches 500,000 Service Hours". Aviation Week Network.
- Guy Norris (Mar 19, 2018). "Pratt: GTF-Powered A320neos To Be Fixed By End Of April". Aviation Week Network.
- "GTF better, says one airline; engine OEMs need 12–18 months to solve issues, says lessor". Leeham News. May 16, 2018.
- "New P&W President Has 'Nothing To Hide' On GTF Starter Issue". Aviation Week. 16 February 2016.
- Thomson Reuters StreetEvents (July 26, 2016). "Edited Transcript of UTX earnings conference call or presentation 26-Jul-16". Yahoo Finance.
- "Airbus: Delivery of P&W 'golden' A320neo engine imminent". Flight Global. 27 July 2016.
- Jens Flottau and Guy Norris (Mar 24, 2017). "Airlines Praise Airbus A320neo Performance, But Engine Issues Remain". Aviation Week & Space Technology.
- Mike Gerzanics (26 May 2017). "Flight test: A321neo stretches its legs". Flight Global.
- Guy Norris (Apr 20, 2017). "Pratt & Whitney begins A320neo engine seal upgrade". Air Transport World. Aviation Week.
- Benjamin Bearup (10 April 2017). "Report: Spirit A320neo Fleet Suffering PW1000G Engine Challenges". Airways Magazine.
- "JetBlue switches A321neos as Pratt troubles persist". Flight Global. 25 Apr 2017.
- Anurag Kotoky, Rick Clough, and Benjamin D Katz (13 Jul 2017). "Pratt Engine Fixes Prompt IndiGo to Ground Seven Airbus Planes". bloomberg.CS1 maint: multiple names: authors list (link)
- Anurag Kotoky (31 Jul 2017). "Pratt's Woes With Engines Spur Compensation to Biggest User". bloomberg.
- Anurag Kotoky (11 Feb 2018). "IndiGo Says Has Made 69 Pratt Engine Replacements in 18 Months". Bloomberg.
- Stephen Trimble (9 Feb 2018). "In-flight failures prompt emergency call for P&W-powered A320neos". Flightglobal.
- Jens Flottau and Aaron Karp (February 10, 2018). "Airbus stops accepting PW1100G engines for A320neo aircraft". Air Transport World. Retrieved 2018-02-11.
- Stephen Trimble (16 Feb 2018). "P&W reaffirms 2018 GTF delivery goal despite part failure". Flightglobal.
- "Pratt & Whitney Implements Solution to PW1100G-JM" (Press release). Pratt & Whitney. Feb 21, 2018.
- Bjorn Fehrm (March 14, 2018). "Pratt & Whitney's Indian trouble". Leeham.
- Stephen Trimble (16 March 2018). "Fixing faulty GTF seal to cost $50 million: P&W". Flightglobal.
- Jens Flottau (Sep 6, 2018). "A320neo Engine Vibration Issue Hits Lufthansa Ops". Aviation Week Network.
- Michael Gubisch (11 Sep 2018). "A320neo operators affected by PW1100G vibration issue". Flightglobal.
- "Engine vibrations unsatisfactory" (PDF). New Zealand aviation news. 2018.
- "IndiGo flight returns to base after 'high vibration' in Pratt & Whitney engine". Reuters. Jan 22, 2019.
- "Airbus A220 and Embraer E2 operators are being advised of cycle limit amendments to the high-pressure compressor hub on their Pratt & Whitney engines". Flightglobal. 4 June 2019.
- Vedant Agarwal (October 31, 2019). "IndiGo's soaring GTF engine problems". bangaloreaviation.com.
- Saurabh Sinha (November 2, 2019). "Change all Neo engines by Jan 31, IndiGo told". Times of India.
- "DGCA extends deadline till May 31 for IndiGo to replace P&W engines". Business Standard. January 13, 2020.
- "Incident: Swiss BCS3 near Paris on Jul 25th 2019, engine shut down in flight". avherald.com. Jul 25, 2019.
- David Kaminiski-Morrow (August 20, 2019). "Public help sought to find fallen Swiss A220 engine parts". FlightGlobal.
- David Kaminiski-Morrow (September 20, 2019). "Second Swiss A220 suffers similar engine rotor failure". Flight Global.
- "Airworthiness Directive 2019-11-11" (PDF). FAA. September 26, 2019.
- David Kaminiski-Morrow (October 15, 2019). "Third Swiss A220 failure spurs urgent engine checks". FlightGlobal.
- David Kaminski-Morrow (15 Oct 2019). "Swiss gradually starts returning A220s to flight status".
- Tim Hepher (October 24, 2019). "Exclusive: Software link suspected in Airbus A220 engine blowouts—sources". Reuters.
- David Kaminski-Morrow (28 Oct 2019). "A220 operators told to limit engine thrust at high altitude". Flightglobal.
- "Type Certificate data sheet IM.E.090 for PW1500G Series Engines" (PDF). EASA. 20 March 2019. Archived from the original (PDF) on 16 April 2018.
- Bjorn Fehrm (November 18, 2016). "Bjorn's Corner: Turbofan engine challenges, Part 4". Leeham.
- "Emergency Airworthiness Directive CF-2019-37" (PDF). Transport Canada. October 25, 2019.
- Sean Broderick (October 25, 2019). "A220 Flight Restrictions Ordered As NTSB Probes Engine Failures". MRO Network.
- David Kaminiski-Morrow (October 30, 2019). "A220 engine checks revised after high-cycle Swiss failure". Flight Global.
- "Incident: Baltic BCS3 near Bordeaux on Feb 12th 2020, uncontained engine failure". Aviation Herald. February 12, 2020.
- Jon Ostrower (30 Nov 2010). "Airbus set to launch A320 NEO". Flight International.
- "Airbus offers new fuel saving engine options for A320 Family" (Press release). Airbus. 1 December 2010.
- Mary Kirby (13 Apr 2010). "P&W seals deal to begin design on GTF for Russia's MS-21". Flight International.
- "PurePower PW1000G Engine". utc.com.
- "PurePower PW1700G & PW1900G Engines" (PDF). Pratt & Whitney.
- Ernest S. Arvai (February 6, 2013). "Embraer Launches E-Jet RE: Assessing the Impact". airinsight.com.
- "Pratt & Whitney Launches Geared Turbofan Engine with Mitsubishi Regional Jet" (Press release). Pratt & Whitney. 9 Oct 2007.
- Stephen Trimble (9 Oct 2007). "Pratt & Whitney Geared Turbofan engine selected to power Mitsubishi Regional Jet". Flight International.
- "Russia will start the production of Sukhoi SuperJet NG in 2019–2020". ruaviation.com. 2 August 2013.
- "Fokker 120 specifications". Rekkof Aircraft.
- "PW1000G". MTU. Archived from the original on 2018-08-18. Retrieved 2016-05-31.
- "Pratt & Whitney Unveils Higher Thrust PurePower Engine" (Press release). Pratt & Whitney. 20 May 2014. Archived from the original on 14 January 2019. Retrieved 23 April 2015.
- "PurePower PW1500G Engine" (PDF). Pratt & Whitney. Archived from the original (PDF) on 2017-10-15.
- Ernest S. Arvai (October 2, 2012). "Technical Analysis: The Core of the PW1000G Geared Turbo-Fan". AirInsight. Archived from the original on July 22, 2019. Retrieved January 31, 2018.
- "Type Certificate Data Sheet No. IM.E.093 for PW1100G-JM Series Engines" (PDF) (06 ed.). EASA. 27 May 2019. Archived (PDF) from the original on 2019-11-01. Retrieved 2019-11-01.
- "Type Certificate Data Sheet No. IM.E.090 for PW1500G Series Engines" (PDF) (06 ed.). EASA. 20 March 2019. Archived (PDF) from the original on 2019-11-01. Retrieved 2019-11-01.
- "Type Certificate data sheet E00094EN" (PDF). FAA. 15 May 2017. Archived (PDF) from the original on 2019-11-01. Retrieved 2019-11-01.
|Wikimedia Commons has media related to Pratt & Whitney PW1000G.|
- Official website
- Rob Coppinger (9 Oct 2007). "MTU Aero Engines designs high-speed turbine for P&W's GTF geared turbofan". Flightglobal.
- Jessica Shapiro (Jun 19, 2008). "Green Technology: Jets Gear up to Fly Greener". Machine Design. Penton. Pratt & Whitney’s geared turbofan program is set to take to the skies with innovations ranging from reduction gearing to low-emission combustion cycles.
- Jon Ostrower (18 Aug 2008). "First phase of GTF flight testing complete". Flightglobal.
- "Pratt & Whitney's Geared Turbofan Growth Plan". Aviation Week & Space Technology. Jul 1, 2013. Tests suggest A320NEO engines will deliver on promises, but who will win in the long term?.
- "Pratt and Whitney PW1100G Geared Turbofan Engine". The Flying Engineer. 8 Jul 2013.
- Stephen Trimble (29 June 2018). "FAA directive calls for part changes on 189 PW1100G engines". flightglobal.
- Stephen Trimble (6 July 2018). "Analysis: P&W details revised geared turbofan recovery path". flightglobal.
- Gregory Polek (July 11, 2018). "Pratt & Whitney Heeds Hard Lessons Learned on GTF". AIN online.