SECTION I. HELICOPTER SYSTEMS
9-1-1. Helicopter Systems.
This section describes helicopter systems emergencies
which ,may reasonably be expected to occur and pres-
ents the procedures to be followed. Emergency opera-
tion of mission equipment is contained in this chapter,
insofar as its use affect safety of flight. Emergency proce-
dures are given in checklist form when applicable. A
condensed version of these procedures is included in TM
55-1520240-10-CL. Refer to figure 9-1-1 and 9-1-2 for
emergency equipment, exits, and entrance.
9-1-2. Immediate Action Emergency Checks.
The urgency of certain emergencies requires
immediate and instinctive action by the pilot.
The most important single consideration is
helicopter control. All other procedures are
subordinate to this requirement. The MAS-
TER CAUTION should be reset after each
malfunction to allow systems to respond to
subsequent malfunctions. When appropriate,
a check of the affected PDP for open circuit
breakers should be accomplished, in some
cases this may minimize or eliminate the em-
ergency. An example of this would be an ap-
parent failure of an instrument, whereas re-
setting the circuit breaker restores operation.
If time permits during a critical emergency,
jettison external loads, and lock shoulder har-
Those steps that must be performed immediately in an
emergency procedure are underlined. These steps
must be performed without reference to the checklist
(CL). When the situation permits, nonunderlined steps
will be accomplished with the use of the CL.
9-1-3. Definition of Emergency Terms.
For the purpose of standardization, the following
definitions shall apply:
a. The term LAND AS SOON AS POSSIBLE is
defined as executing a landing to the nearest suitable
landing area. (e.g., open field) without delay. ( the
primary consideration is to assure the survival of
b. The term LAND AS SOON AS PRACTICABLE is
defined as executing a landing at the nearest suitable
c. The term AUTOROTATE is defined as adjusting
the flight controls as necessary to establish an autorota-
tional descent and landing.
1. Thrust control Adjust as required to
2. Pedals Adjust as required.
3. Cyclic Adjust as required.
d. The term EMER ENG SHUTDOWN is defined as
engine shutdown without delay. Engine shutdown in
flight is usually not an immediate action unless a fire
exists. Before executing an engine shutdown, identify the
affected engine by checking indications of torque,
RRPM. N1, PTIT, engine oil pressure and 714A ENG
When in-flight shutdown of a malfunctioning
engine is anticipated positive identification
of the malfunctioning engine must be ac-
complished to avoid shutting down the
1. ENG COND lever STOP.
2. FIRE PULL handle PULL (engine fire
3. AGENT DISCH switch As required. (en-
gine fire only).
e. The term ABORT START is defined as engine
shutdown to prevent PTIT from exceding limits orwhe-
never abnormal operation is indicated. If high PTIT was
indicated, the engine must be monitered to decrease
PTIT below 260_C.
1. ENG COND lever STOP.
2. ENG START switch MTR (if high PTIT is
If a second engine start is to be attempted,
wait at least 15 seconds after the N1 tacome-
ter indicates zero before attempting start.
This will allow sufficient time for fuel to drain
from the combustion chamber.
9-1-4. Emergency Warning Signals and Exits.
The helicopter is equipped with an emergency troop
alarm and jump light system. The following standard sig-