U. Attach hoist assemblies to engine support beams. Adjust hoists to leave approximately 1/2 inch slack.
V. Position engine transportation dolly under engine.
WARNING: FAILURE TO PERFORM STEPS W THROUGH AD IN SEQUENCE, STEP BY STEP, MAY IMPOSE UNDUE LOADS THAT COULD RESULT IN DAMAGE TO ENGINE, EQUIPMENT, OR AIRFRAME AND POSSIBLE INJURY TO PERSONNEL. WHEN USING THE LOAD INDICATING SYSTEM HOIST EQUIPMENT DO NOT EXCEED THE FOLLOWING LOAD LIMITS:
INBOARD FORWARD 1900 POUNDS INBOARD AFT 3000 POUNDS OUTBOARD 3000 POUNDS
CAUTION: THE FOLLOWING STEPS W THROUGH AD MUST BE PERFORMED IN ORDER OF SEQUENCE. DO NOT RAISE OR LOWER INBOARD AFT CHAIN FALL WHEN THE FORWARD CONE BOLTS ARE SEATED AND AT THE SAME TIME, THE FORWARD CHAIN FALLS ARE LOADED.
W. Clean exposed threads on cone bolts, then raise inboard aft chain fall to support its portion of the engine weight.
X. Raise outboard chain fall to support its portion of the engine weight.
Y. Raise inboard forward chain fall to support its portion of the engine weight.
Z. Remove the link assembly and cone bolt nuts.
(1)
NON-ENERGY ABSORBING CABLE SECONDARY SUPPORT LINKS; Remove the link cable and keeper from the cable retainer (AMM 71-21-11/401).
(2)
ENERGY ABSORBING SECONDARY SUPPORT LINKS WITHOUT CRUSHABLE SPACER; Remove the nut, washer (if any) and crushable spacer from the retainer of the secondary support link (AMM 71-21-11/401).
(3)
ENERGY ABSORBING SECONDARY SUPPORT LINKS WITHOUT CRUSHABLE SPACER; Remove the nut, washer assembly and chamfered washer from the retainer of the secondary support link (AMM 71-21-11/401).
(4)
Remove the cone bolt nut and washers.
(5) Install cone bolt thread protectors (F70266-304) at all three cone bolts. AA. Remove thrust reverser deflector door fairing (Ref Chapter 78, Exhaust).
CAUTION: DAMAGE TO AFT FAIRING SEAL CAN OCCUR IF ENGINE IS LOWERED PRIOR TO REMOVING THRUST REVERSER DEFLECTOR DOOR FAIRING.
AB. Carefully lower outboard chain fall until outboard cone bolt has dropped approximately one-quarter inch from full-seated position.
AC. Carefully lower inboard forward chain fall until inboard cone bolt has dropped approximately one-quarter inch from full-seated position.
AD. Carefully lower inboard aft chain fall until aft cone bolt has dropped approximately one-quarter inch from full-seated position.
CAUTION: EXCEEDING THE ABOVE DIMENSIONS WHILE LOWERING ENGINE COULD RESULT IN DAMAGE TO LINES AND/OR FITTINGS.
506
May 01/00 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 71-00 Page 413/414
AE. Disconnect thrust reverser hydraulic lines at fittings located at 6 o’clock position and drain residual hydraulic fluid. Reconnect and tighten hydraulic lines after draining. Disconnect thrust reverser hydraulic lines at disconnect fittings (Fig. 404).
NOTE: Removal of aft access panel 5140L or 5240R may facilitate in the disconnection or connection of thrust reverser hydraulic lines at disconnect fittings.
AF. Lower engine and secure to transportation dolly.
5E4 Jun 20/88 71-00 Page 414A/414B BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
5. Prepare to Install Power Plant
A. Check that airplane is still in configuration necessary for engine removal, including:
(1)
Airplane - Grounded to approved grounding lug.
(2)
Ground Power Switch - OFF.
(3)
Battery Switch - OFF.
(4)
Applicable Fire Switch - Pulled.
(5)
FUEL FLOW Circuit Breakers - Pulled.
(6)
Ground Electrical Power Receptacle - Tagged to prevent use.
(7)
Hydraulic system A - Depressurized.
(8)
Airstairs - Retracted (AMM 52-61-0).
(9)
Check forward and aft engine mounts (AMM 54-41-0/601), hoist attach fittings and related wing support structure for evidence of loose fasteners, nicks, cracks, gouges, chipped finish and/or signs of visible damage.
B. If Nickel Alloy 718 bolt with related nut and cotter pin is not installed, install new nut for inboard forward engine mount (AMM 54-41-11/401).
C. Deleted.
D. Check cone bolt nuts at forward and aft engine mounts for correct locking torque when nuts are installed.
CAUTION: CONE BOLT NUTS WITH LOCKING TORQUE OF 90 - 200 POUND-INCHES ARE REQUIRED. THREADS MUST BE LUBRICATED WITH EASE-OFF 990 WHEN CHECKING TORQUE.
E. Ensure conical surface of each cone bolt and mating vibration isolator is clean. Install thread protectors on cone bolts.
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