HEADQUARTERS OH-58A, Technical Manual

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CHAPTER 9
EMERGENCY PROCEDURES
SECTION I. AIRCRAFT SYSTEMS
9-1. HELICOPTER SYSTEMS. This section de-
scribes the helicopter systems emergencies that may
reasonably be expected to occur and presents the
procedures to be followed. Emergency operation of
mission equipment is contained in this chapter insofar
as its use affects safety of fl ight. Emergency proce-
dures are given in checklist from when applicable. A
condensed version of these procedures is contained in
the condensed checklist.
9-2. IMMEDIATE ACTION EMERGENCY STEPS.
NOTE
The urgency of certain emergencies requires
immediate and instinctive action by the pilot.
The most important single consideration is he-
licopter control. All procedures are subordinate
to this requirement. The MASTER CAUTION
should be reset after each malfunction to al-
low systems to respond to subsequent malfunc-
tions. If time permits during a critical emer-
gency, transmit MAYDAY call, set transponder
to emergency, jettison external stores if appro-
priate, and lock shoulder harnesses.
Those steps that must be performed immediately in an
emergency situation are underlined. These steps must
be performed without reference to the checklist. When
the situation permits, nonunderlined steps will be ac-
complished with the use of the checklist.
9-3. DEFINITION OF EMERGENCY TERMS. For
the purpose of standardization, the following de fi nitions
shall apply:
a. The term LAND AS SOON AS POSSIBLE is
de fi ned as landing at the nearest suitable landing area
(e.g., open fi eld) without delay. (The primary considera-
tion is to ensure the survival of occupants.)
b. The term LAND AS SOON AS PRACTICABLE
is de fi ned as landing at a suitable landing area. (The
primary consideration is the urgency of the emergency).
c. The term AUTOROTATE is de fi ned as adjusting
the fl ight controls as necessary to establish an autoro-
tational descent and landing.
d. The term EMER SHUTDOWN is de fi ned as en-
gine shutdown without delay.
1. Throttle — Close.
2. Fuel Shutoff Valve Handle — OFF.
3. BAT switch — OFF. Before turning
the battery switch off during in- fl ight
emergencies requiring EMER
SHUTDOWN, the pilot should consider a
“MAYDAY” call, setting the transponder to
EMER, and the possible adverse effects of
total electrical failure.
NOTE
Total electrical failure in the OH-58C will result
in loss of rotor RPM indications.
9-4. AFTER EMERGENCY ACTION. After a mal-
function of equipment has occurred, appropriate emer-
gency actions have been taken, and the helicopter is
on the ground, an entry shall be made in the Remarks
section of DA Form 2408-13-1 describing the malfunc-
tion. Ground and fl ight operations shall be discontinued
until corrective action has been taken.
9-5. EMERGENCY EQUIPMENT. A fi re extinguisher
and fi rst aid kit ( fi gure 9-1) are mounted on the right of
the center post behind the pilot seat.
9-6. EMERGENCY EXITS/EMERGENCY EN-
TRANCE. Emergency exits are shown in fi gure
9-1. Emergency jettison handles are yellow. To exit the
aircraft in an emergency, fi rst attempt to open doors. If
doors will not open, use emergency jettison handles.
The crew doors can be jettisoned by pulling the yellow
handles to the aft position and the cabin doors by mov-
ing the yellow handles to the forward position. If doors
will not jettison, break plexiglass to exit the aircraft.
9-7. ENGINE MALFUNCTION – PARTIAL OR
COMPLETE POWER LOSS.
NOTE
Under any partial power condition, the throt-
tle should be checked to ensure it is full open
and, time and altitude permitting, the GOV RPM
switch may be increased to ensure maximum
RPM is applied.
a. The indications of an engine malfunction, ei-
ther a partial or a complete power loss, are: left yaw,
drop in engine RPM, drop in rotor RPM, low RPM audio
alarm, illumination of ROTOR RPM warning light, EN-
GINE OUT warning light, and change in engine noise.
Change 14 9-1
TM 55-1520-228-10