HEADQUARTERS OH-58A, Technical Manual

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TM 55-1520-228-10
CHAPTER 5
OPERATING LIMITS AND RESTRICTIONS
SECTION I. GENERAL
5-1. PURPOSE.
This chapter includes all important operating limits and
restrictions that must be observed during ground and
fl ight operations.
5-2. GENERAL.
The operating limitations set forth in this chapter are the
direct results of design analysis, tests, and operating ex-
periences. Compliance with these limits will allow the
pilot to safely perform the assigned missions and to de-
rive maximum utility from the helicopter.
5-3. EXCEEDING OPERATIONAL LIMITS.
Anytime an operational limit is exceeded, an appropriate
entry shall be made on DA Form 2408-13-1. Entry shall
state what limit or limits were exceeded, range, time be-
yond limits, and any additional data to aid maintenance
personnel in the required inspection.
5-4. MINIMUM CREW REQUIREMENTS.
The minimum crew requirement consists of only the pi-
lot, whose station is at the right side of the aircraft. Ad-
ditional crewmembers as required will be added at the
discretion of the commander, in accordance with perti-
nent Department of the Army regulations.
SECTION II. SYSTEMS LIMITS
5-5. INSTRUMENT MARKINGS.
The operating ranges for both the helicopter and engine
are listed below and shown in fi gure 5-1
A
. and fi gure
5-2
C
. .
NOTE
For OH-58A aircraft, reference fi gure 5-2
for power turbine tachometer, gas producer
tachometer, torquemeter, and turbine outlet
temperature.
a. Operating Limitations and Ranges. Operating
limitations and ranges are illustrated by the colored
markings which appear on the dial faces of engine,
fl ight, and utility system instruments. Red markings on
the dial faces of these instruments indicate the limit
above or below which continued operation is likely to
cause damage or shorten life. The green markings
on instrument indicate the safe or normal range of
operation. The yellow markings on instruments indicate
the range when special attention should be given to
the operation covered by the instrument. Operation is
permissible in the yellow range, but is time limited. The
blue markings on instruments indicate recommended
maximum IAS for autorotation. (Green areas will have
a single line and yellow areas two yellow lines. This is
for identi fi cation under night lighting conditions or when
using night vision goggles
C
. ).
b.
A
. Limitation Markings. Limitation markings
consist of strips of semi-transparent color tape which
adhere to the glass outside of an indicator dial. All round
instruments that have range markings on glass face
must also have a white slippage mark between glass
and frame. All other limitation markings are painted on
dial faces under glasses.
c.
C
. Limitation Markings. The instrument mark-
ings containing the saw tooth red line ( ▼▼▼ ) are
placed on the dial face with respect to the operating
limit as shown in fi gure 5-2. The saw tooth edge of the
red lines serves to caution the pilot that he is approach-
ing a limit as shown in fi gure 5-2, Detail A. A white
dot on the face of the instrument indicates the safe or
normal range of operation. A chevron (««) indicates
above or below operating limits and to go in direction of
point.
Change 14 5-1