TM 55-1520-240-23-3
4-44
ADJUST ENGINE FIREWALL AND ENGINE COVER FORMER
4-44
INITIAL SETUP
Applicable Configurations:
All
Tools:
Aircraft Mechanic’s Tool Kit, NSN 5180-00-323-4692
Thickness Gage
Materials:
None
Personnel Required:
Medium Helicopter Repairer
Inspector
Equipment Condition:
Battery Disconnected (Task 1-39)
Electrical Power Off
Engine Work Platform Open (Task 2-2)
Engine Access Cover Open (Task 4-49)
Exhaust Cone Removed (Task 4-88)
NOTE
Procedure is same to adjust engine
firewall and engine cover former on
No. 1 or No. 2 engine. Adjustment of
No. 1 engine firewall and cover former
is shown here.
1.
Measure seal compression between airframe
former (1) and engine former seal (2). If seal
appears to be compressed 0.040 to 0.100 inch,
go to Follow-On Maintenance. If not, go to step 2.
2.
Loosen 20 bolts (3) and five screws (4).
3.
Adjust airframe former (1) and seal (2) with a
clearance of up to 0.375 inch.
4.
Tighten 20 bolts (3) and five screws (4).
INSPECT
FOLLOW-ON MAINTENANCE:
Install exhaust cone (Task 4-90).
Close engine access cover (Task 4-50).
Close engine work platform (Task 2-2).
NO BREAK - WORK HARDER
NO BREAK - WORK HARDER
NO BREAK - WORK HARDER
END OF TASK
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