Kaddyuk From Wallis and Futuna, joined Nov 2001, 4125 posts, RR: 29 Reply 1, posted (7 years 6 months 5 days ago) and read 4249 times:
It depends on alot of factors...
1) The number of men in your team
2) The status of the new engine. If your new ongoing engine is missing all the components that attach to the gearbox then its going to take alot longer because you'll have to swap over the items from the old engine to the new one.
3) General status of the engine, some engines are just easier to change than others.
If you have everything in place when you need it then you can normally completely change an engine inside 10hrs. It can take an awful lot longer and 18hrs is not unheard of
Whoever said "laughter is the best medicine" never had Gonorrhea
SlamClick From United States of America, joined Nov 2003, 10062 posts, RR: 71 Reply 3, posted (7 years 6 months 4 days 23 hours ago) and read 4222 times:
I changed an engine into an ingot in about three seconds once.
Happiness is not seeing another trite Ste. Maarten photo all week long.
FutureUApilot From United States of America, joined May 2004, 1365 posts, RR: 4 Reply 4, posted (7 years 6 months 4 days 22 hours ago) and read 4208 times:
Maintenance here at ATW can completely take out the engine, do all the checks it needs, and have it back on and working in less than 7 hours. 3 guys on a team I believe.
LMP737 From , joined Dec 1969, posts, RR: Reply 5, posted (7 years 6 months 4 days 22 hours ago) and read 4207 times:
Quoting Kaddyuk (Reply 1): 1) The number of men in your team
Also the experience level of the guys on your team and how often they work together. You get a bunch of guys who work together on a regular basis it makes for a much shorter engine change. They get so good at it they can anticipate what the others are going to do.
JarheadK5 From United States of America, joined Nov 2005, 216 posts, RR: 1 Reply 8, posted (7 years 6 months 4 days 21 hours ago) and read 4180 times:
IMO, the biggest factors are:
1. The experience level of the crew, and how long they've worked together.
2. Whether the new engine has all the accessories already installed.
With an experienced crew, we used to change engines, rig, and be ready for test-flight in about 4 hours on the CH-53E.
BUT, throw a couple new guys on the job, or come up missing tools, and it can turn into an all-nighter... ask me how I know.
NKP S2 From United States of America, joined Dec 1999, 1714 posts, RR: 6 Reply 10, posted (7 years 6 months 4 days 19 hours ago) and read 4148 times:
Other factors, in addition to the completeness of the new engine, # of men, cohesiveness of the crew etc.
1) Issues discovered during the change, mostly relating to security/integrity of the pylon/firewall area, wiring, bushings etc
2) Any mods, or "convenience" items: Mounts, precoolers, offtakes etc done while access is available.
3) Completeness of the engine change kit: They can be well travelled, and there's noithing worse than having the whole shebang held up because of a damaged dynamometer or missing clevis pin or shackle.
4) Weather: Yes, it will take longer in bitter cold, rain, freezing rain, or on a 100 degree humid hardstand.
5) How much "boostrap" equipment is required. On some aircraft/engine combos, these can be quite elaborate and cumbersome. Larger A/C often require you to be like some acrobatic Tarzan type to install/remove it, as well as acess the mount points. Also, refer to point #3 again......
Yes, some A/C engines can be R&R'd remarkably fast, but really, due the points above and in other posts, I always say when asked: "It depends on whether the airplane is smiling of frowning that day".
GDB From United Kingdom, joined May 2001, 12706 posts, RR: 80 Reply 11, posted (7 years 6 months 4 days 17 hours ago) and read 4111 times:
In BA Concorde, we were lucky in having plenty of very experienced people who worked well together.
A good bunch, with a positive attitude, could get an Olympus off, stick the new one on, within a shift (7.5 hours).
This counted having the aircraft ready to go for a run on the pipes, better yet, going and doing it before shift end.
Fr8mech From United States of America, joined Sep 2005, 4242 posts, RR: 12 Reply 12, posted (7 years 6 months 4 days 15 hours ago) and read 4070 times:
Quoting FutureUApilot (Reply 4): Maintenance here at ATW can completely take out the engine, do all the checks it needs, and have it back on and working in less than 7 hours. 3 guys on a team I believe.
I'm interested in what kind of aircraft that is.
Way back when I worked at Pan Am, we could do a JT9D engine change in between 5 & 6 hours, assuming no firewall issues and assuming a "quick engine change (QEC)" engine.
The longest I've seen any engine change take is 23 days. We found several cracks during the firewall/pylon inspection.
EMBQA From United States of America, joined Oct 2003, 9286 posts, RR: 13 Reply 13, posted (7 years 6 months 4 days 14 hours ago) and read 4038 times:
Quoting Fr8mech (Reply 12): I'm interested in what kind of aircraft that is.
I think he's talking about a CRJ with CFM34's. That's about right. A lot depends on the talent of the crew. I've seen a Saab 340 CT-7 completely done and ready for revenue departure in about 6 hours....and that included a PGB split and parts change over..... and I've seen the same job done in three days.
"It's not the size of the dog in the fight, but the size of the fight in the dog"
NKP S2 From United States of America, joined Dec 1999, 1714 posts, RR: 6 Reply 14, posted (7 years 6 months 4 days 13 hours ago) and read 4027 times:
Some A/C have unusually easy engine R&Rs. I know the ex-PSA guys I work with said you could R&R an engine on a BAE-146 in 2 hours or so and described the process in detail. Even considering that the engines they received were "ready to hang" ( and I can't stress enough to laymen that this makes a HUGE difference ) that is amazingly quick; Which was just as well ( or unfortunate ) as they needed to be changed quite often according to them.
Fr8Mech From United States of America, joined Sep 2005, 4242 posts, RR: 12 Reply 18, posted (7 years 6 months 3 days 15 hours ago) and read 3836 times:
Quoting HAWK21M (Reply 15): If I remember right,a QECA [Quick Engine Change Assy] change on a B732 used to be 30 minutes Theoritically.
regds
I'm thinking that you're remembering wrong. I've never changed a B737 engine, but I've changed plenty of B727 engines. I suspect that the number 2 on a B727 hangs about the same as a B737, minus the ring cowl bolts. The fastest I've heard of a B727, #2 engine is 4 hours. Call it 45 minutes (1 person) for the ring bolts and you get about 3.25 hours.
Lightsaber From United States of America, joined Jan 2005, 10649 posts, RR: 100 Reply 19, posted (7 years 6 months 3 days 15 hours ago) and read 3822 times:
Quoting SlamClick (Reply 3): I changed an engine into an ingot in about three seconds once.
CO dropped an engine at PBI once (onto a nearby suburb, no one hurt). Does that count? What was funny, is that they had a crew out to the engine with it on its way to the airport in less than ten minutes, before the press even arrived! The local paper had a hissyfit as they didn't get a single picture. (Simplified the investigation too, no days of taking photos in front of someone's house.)
Quoting HAWK21M (Reply 15): If I remember right,a QECA [Quick Engine Change Assy] change on a B732 used to be 30 minutes Theoritically.
regds
MEL
Quoting Kaddyuk (Reply 17): 30 Mins? Thats insane... are you sure???
I've found this discussion very interesting. I've come from the prototype world where some of these engines were *designed* with 15 minute changeout times. Obviously a disconnect with reality. Add to that 15 minutes a 15 minute crew brief, 30 minutes to collect everything, 45 minutes for inspection/QA/paperwork, and the real world minimum changeouts were predicted to be 2 hours.
Midnights From United States of America, joined Aug 2005, 62 posts, RR: 0 Reply 20, posted (7 years 6 months 3 days 14 hours ago) and read 3820 times:
When I worked at SFO we could change a 767 motor dune, spun and run in about 5 or 6 hrs. I've seen a A300 engine changed in an 8 hr shift and I was involved in an MD-80 eng change with a full conversion in 4 hrs, 6 guys on a very cold night in DCA so we were motivated to get done.
FutureUApilot From United States of America, joined May 2004, 1365 posts, RR: 4 Reply 22, posted (7 years 6 months 3 days 8 hours ago) and read 3770 times:
Quoting Fr8mech (Reply 12):
I'm interested in what kind of aircraft that is.
Quoting EMBQA (Reply 13): I think he's talking about a CRJ with CFM34's. That's about right.
Nope, it's a BAe-146. I should say they also do alot of other tests with the aircraft, not only engines. They can get one plane in and out in one night so it's ready to go again in the morning. Good old Air Wisconsin!
Venus6971 From United States of America, joined Dec 2004, 1409 posts, RR: 1 Reply 23, posted (7 years 6 months 3 days 6 hours ago) and read 3746 times:
On a 707/E-3a can have a out board motor up in about 4 hours if everything goes right and got a crew that knows what it is doing, inboard motor 6 hours always run into problems with the utility hydraulic system. The op checks and trim under 8 hours if evrything goes right.
Scarebus03 From Ireland, joined Apr 2005, 291 posts, RR: 2 Reply 24, posted (7 years 6 months 3 days 6 hours ago) and read 3737 times:
Usually from my experience the bigger the engine the quicker the change. Fr8mech remember the fuel/oil cooler on the -9D?........ouch!!
SB03
No faults found......................
25 HAWK21M: Thats why the Word "Theoritically".Boeing & P&W specified that 30 minutes would be adequate after they carried out trial run.Although as slamclick me
26 Smcmac32msn: I've seen NW have a DC-9 come into MSN at about 1800 local one day with a bum engine and they were able to send it back out with passengers at 0600 an
27 EMBQA: Not really much to brag about. If you can't get an engine changed on an overnight with a BAe146 or a Avro 85 it's time to look for a new line of work
28 Fr8mech: Do you mean replacing it? I'd rather change the cooler than the PRBC and/or fuel/air converter (on the non-TWA engines). Hell, I'd rather change an e
29 CitationJet: I have seen Braniff change an engine on a 747-100 while parked at the departure gate in DFW once, it took five hours. All of us passengers sat and wat
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From Wallis and Futuna, joined Nov 2001, 4125 posts, 
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CO dropped an engine at PBI once (onto a nearby suburb, no one hurt). Does that count? 
What was funny, is that they had a crew out to the engine with it on its way to the airport in less than ten minutes, before the press even arrived! The local paper had a hissyfit as they didn't get a single picture. (Simplified the investigation too, no days of taking photos in front of someone's house.) 
From New Zealand, joined May 2004, 2188 posts, 
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