TM 55-1510-221-10
5-1. PURPOSE.
CHAPTER 5
Operating Limits and Restrictions
Section I. GENERAL
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 crewmembers 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.
5-1
