TM 1-1520-238-MTF
4-28
N. AUDIO WARNING SYSTEM OPERATIONAL
CHECK.
NOTE
All or part of this check may be required.
The actual check may be broken into sever-
al parts and completed when convenient.
However, the applicable portions of the
check will be completed prior to flight.
1. Engine out audio warning – Check as follows:
Before starting APU – Pilot/CPG.
a. BATT/EXT PWR switch – BATT or EXT
PWR as required.
b. Engine out audio – Verify present in both
headsets, then reset.
2. Stabilator fail audio warning – Check as follows:
After starting APU – Pilot/CPG.
a. STAB AUTO AC circuit breaker – Pull.
Verify stabilator fail audio is present in both
headsets. Reset using pilots stabilator
RESET button.
b. STAB AUTO AC circuit breaker – Reset.
Then pull. Verify same as step a. Reset
using CPGs stabilator RESET button.
3. HIGH RPM ROTOR warning light – Check as
follows:
After starting engines – Pilot/CPG.
CAUTION
Delaying decrease of PWR lever may re-
sult in an engine/rotor overspeed.
