TM 55-1520-240-T
15-5.5.1 ENGINE HYDRAULIC STARTING SYSTEM OPERATIONAL CHECK
15-5.5.1
INITIAL SETUP
Equipment Condition:
Applicable Configurations:
TM 55-1520-240-23:
With 74
Battery Connected
Electrical Power On
Tools:
Hydraulic Power On
None
Ignition Switch Off (Key Removed)
Materials:
General Safety Instructions:
None
Personnel Required:
WARNING
Medium Helicopter Repairer (2)
References:
Make sure that rotor blades are clear of
TM 55-1520-240-23
obstructions and that personnel are
aware that rotor blades may turn dur-
ing engine motoring. Turning blades
can cause damage or serious injury to
personnel.
TASK
RESULT
1.
Check that ENGINE NO. 1 START & IGN circuit
If START & IGN circuit breaker (1) is open, close it. If it
breaker (1) is closed.
opens again, go to task 4-10.4.
2.
Check that ENGINE NO. 2 START & IGN circuit
If START & IGN circuit breaker (2) is open, close it. If it
breaker (2) is closed.
opens again, go to task 4-10.4.
3.
Check that ENGINE NO. 1 and ENGINE NO. 2 PRI
If PRI CONT circuit breakers (3) and (4) are closed, open
CONT circuit breakers (3) and (4) are opened.
them.
4.
Check that ENGINE NO. 1 and ENGINE NO. 2 REV
IF REV CONT circuit breakers (5) and (6) are closed,
CONT circuit breakers (5) and (6) are opened.
open them.
MOTOR NO. 1 ENGINE
5.
On the FADEC panel, set and hold ENG START
The NO. 1 ENGINE N1 tachometer (8) must indicate 10 to
switch (7) to 1.
15% N1 as starter motors engine. If the engine does not
motor, go to task 15-5.6.1.
6.
Release the ENG START switch (7) to its center
The NO. 1 ENGINE N1 tachometer (8) indication must
position.
decrease to 0% N1. If the tachometer indication does not
decrease or the engine continues to motor, go to task
15-5.7.
GO TO NEXT PAGE
15-96.2 Change 23
