sharpnfuzzy
Posts: 557
Joined: Fri Jun 22, 2001 2:24 pm

Process Of Changing A Jet Engine

Tue Oct 16, 2001 10:10 am

Hi, does anyone know where I can find online resources about the process of changing or replacing an engine on a commercial jet?... things like 'Process Reports' would be great!
 
VC-10
Posts: 3546
Joined: Tue Oct 26, 1999 11:34 am

RE: Process Of Changing A Jet Engine

Tue Oct 16, 2001 8:01 pm

Basically it's as follows :-

1. Pull the Circuit Breakers (CB's) for the Fire Extingushers and Ignitors

2. Pull the fire handle (to isolate the engine from the fuel & hydraulic systems)

3. Pull the CB's for ralated engine electrics (instruments, Generators, pneumatics etc)

4. Open/Remove cowlings.

5. Disconnect:
a) Hydraulics lines (Supply, Pressure & Case drain)
b) Fuel Line
c) Pneumatic Duct & Nacelle anti-ice
d) Electrical Cables (Gen feeder, instumentation connectors etc)
e) Engine Controls

6. Fit hoist gear to pylon

7. Fit Engine stand adaptors to engine

8. Winch engine stand to engine and tension winch to take the weight, this is indicated by load scales fitted to the winches

9. Release engine mount bolts/nuts, depending on installation (one or two at front of engine, 4 at the back)

10. Winch engine to ground and push out of the way

11. Carry out inspection of pylon lower surface (looking cracked firewall, wear in the engine mount structure, check electrical connector pins for wear/burning.

12. Wheel new engine into postion & winch up ad pre-load engines against engine mounts (or, depending on engine type, bring engine to within 1/4 inch of mount faces and fit bolts and pull engine up to mount faces) fit mount bolts/nuts and torque load to around 350 Lbs ft (actual figure depending on a/c type)

13. Reconnect every thing you disconnected

14. Rig engine controls

15. Reset CB's

16. Reset Fire Handle

17. Carry out ignitor function check

18. Pressurise fuel/hydraulic/pneumatic lines and check for leaks

19. Carry out a wet motoring cycle (Turn engine over on starter motor and add fuel but no ignition) and check for leaks

20. Close/fit cowlings

21. Take a/c down to run pen and give the new engine a sound thrashing, check the engine systems ( generator, thrust reverser/anti-ice/fuel heat etc) and adjust the trim as necessary. On a FADEC engine you may just need to do an idle run if the engine has been test cell run.


I hope that answers your question.

To the experts, the above is a generalistion and not supposed to be type specific.
 
A/c train
Posts: 674
Joined: Sun Jun 10, 2001 7:57 am

VC-10

Wed Oct 17, 2001 4:49 am

Very impressive VC-10,
regards
a/c
 
sharpnfuzzy
Posts: 557
Joined: Fri Jun 22, 2001 2:24 pm

RE: VC-10

Wed Oct 17, 2001 5:46 am

Yeah, impressive indeed, thanks a lot
 
DC-10Tech
Posts: 291
Joined: Fri Jun 15, 2001 6:40 pm

RE: Process Of Changing A Jet Engine

Thu Oct 18, 2001 5:54 am

And here's what it looks like:

Engine Change
Forums.AMTCentral.com
 
airlinelover
Posts: 5287
Joined: Thu Jun 07, 2001 8:03 am

RE: Process Of Changing A Jet Engine

Sun Oct 21, 2001 12:32 pm

It looks like just the innards of the engine, and not the outer casing, are being removed.. Is this true?

Chris
Lets do some sexy math. We add you, subtract your clothes, divide your legs and multiply
 
242
Posts: 495
Joined: Tue Oct 24, 2000 1:10 pm

RE: Process Of Changing A Jet Engine

Sun Oct 21, 2001 2:35 pm

The entire engine is being removed in that photo. The "outer casing" is actually the fan, reverser and core cowls still attached. Depending on the aircraft, (some require the fan and core cowl removal) this is standard procedure.
 
VC-10
Posts: 3546
Joined: Tue Oct 26, 1999 11:34 am

RE: Process Of Changing A Jet Engine

Sun Oct 21, 2001 5:18 pm


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