TM 55-1510-220-10
CHAPTER 5
OPERATING LIMITS AND RESTRICTIONS
Section I. GENERAL
5-1. PURPOSE.
This chapter identifies or refers to all important
operating limits and restrictions that shall be observed
during ground and flight operations.
5-2. GENERAL.
The operating limitations set forth in this chapter
are the direct result of design analysis, tests, and
operating experiences. Compliance with these limits will
allow the pilot to safely perform the assigned missions
and to derive maximum utility from the aircraft. Limits
concerning maneuvers, weight, and center of gravity are
also covered in this chapter.
5-3. EXCEEDING OPERATIONAL LIMITS.
Anytime an operational limit is exceeded an
appropriate entry shall be made on DA Form 2408-13.
Entry shall state what limit or limits were exceeded,
range, time beyond limits, and any additional data that
would aid maintenance personnel in the maintenance
action that may be required.
5-4. MINIMUM CREW REQUIREMENTS.
The minimum crew required for aircraft operation is
two pilots. Additional crew members as required will be
added at the discretion of the commander, in accordance
with pertinent Department of the Army regulations.
Section II. SYSTEM LIMITS
5-5. INSTRUMENT MARKINGS.
Instruments which display operating limitations are
illustrated in figure 5-1. The operating limitations are
color coded on the instrument faces. Color coding of
each instrument is explained in the illustration.
5-6. INSTRUMENT MARKING COLOR CODES.
Operating limitations and ranges are illustrated by
the colored markings which appear on the dial faces of
engine, flight, and utility system instruments. Red
markings indicate the limit above or below which
continued operation is likely to cause damage or shorten
life. The green markings indicate the safe or normal
range of operation. The yellow markings indicate the
range when special attention should be given to the
operation covered by the instrument. Operation is
permissible in the yellow range, but should be avoided.
White markings on the airspeed indicator denotes flap
operating range. The blue marking on the airspeed
indicator denotes best rate of climb with one engine
inoperative, at maximum gross weight, maximum forward
c.g., sea level standard day conditions.
5-7. PROPELLER LIMITATIONS.
The maximum propeller overspeed limit is 2200
RPM. Propeller speeds above 2000 RPM indicate failure
of the primary governor. Propeller speeds above 2080
RPM indicate failure of both primary and secondary
governors. Torque is limited to 81% for sustained
operation above 2000 RPM.
5-8. STARTER LIMITATIONS.
The starters in this aircraft are limited to an
operating period of 30 seconds ON, then 5 minutes OFF,
for two starter operations. After two starter operations the
starter shall be operated for 30 seconds ON, then 30
minutes OFF.
5-9. AUTOPILOT LIMITATIONS.
a. An autopilot preflight check must be conducted
and found satisfactory prior to each flight on which the
autopilot is to be used.
5-1
