TM 55-1520-228-10
CHAPTER 5
OPERATING LIMITS AND RESTRICTIONS
SECTION I. GENER AL
5-1. PURPOSE.
This chapter includes all important operating limits and
restrictions that must be observed during ground and
flight operations.
5-2. GENERAL.
The op erating limitation s set forth in this chapter are the
direct results of design analysis, tests, and operating ex-
periences. Complia n c e with these limits will allow the
pilot to safely perform the assigned missions and to de-
rive maximum utility from the helicop ter.
5-3. EXCEEDING OPERATIONA L 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 REQUIREMEN TS.
The minimum crew requirement consists of only the pi-
lot, whose statio n 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 figure 5-1
A. and figure
5-2
C..
NOTE
For OH-58A aircraft, reference figure 5-2
for power turbine tachometer, gas pro
ducer
tachometer, torquemeter, and turbine outlet
temperature .
a. Operating Limitations and Ranges. Operating
limitations and ra ng es are illus
trated by the colored
markings which appear on the dial faces of engine,
flight, and utility system in struments. Red markings on
the dial faces of these instrum
ents indicate the limit
above or below which continued operation is likely to
cause damage or shorten life. The green markings
on instrument indicate the sa
fe 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 are
as will have
a single line and yellow areas tw o yello w lines. This is
for identification under night lighting conditions or when
using n ight vision goggles
C.).
b.
A. Limitation Markings. Limitation markings
consist of strips of semi-transpar
ent 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 mar
k 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 re
spect to the operating
limit as show n in figure 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 figure
5-2, D et ail A. A white
dot on the face of the instrument indicates the safe or
normal range of operation. A chevron (««) indicates
above or below operatin
g limits an d to go in direction of
point.
Change 14 5-1
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