TM 1-1510-262-10
OPERATING LIMITS AND RESTRICTIONS
SECTION I. GENERAL
5-1. PURPOSE.
This chapter identiies or refers to all important operating limits and restrictions that shall be observed during ground
and light operations.
5-2. GENERAL.
The operating limitations set forth in this chapter are the direct result of design analysis, tests, and operating ex-
periences. 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 2408-13-1. Entry shall
state what limit or limits were exceeded, range, time beyond limits, and any additional data that would aid mainte-
nance 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 igure 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,
light, 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 in the yellow range is permissible, but should be avoided. Airspeed tape markings on the Primary Flight
Display (PFD) are described in detail in the vendor s EFI-890R Operator s Manual. Figure 5-1 (Sheet 1) shows the
basic layout of the airspeed tape.
5-7. PROPELLER LIMITATIONS.
Extended operation with propeller RPM below 1000 (excluding FEATHERED) may cause damage to
the aircraft.
The maximum propeller overspeed limit is 1870 RPM (transient, 20 seconds maximum). Propeller speeds above
1700 RPM indicate failure of the constant speed governor. Propeller speeds above 1802 RPM indicates failure
of both the constant speed and overspeed governors. The minimum sustained RPM is 1000 RPM. Transitioning
between 0 1000 RPM (Engine start/shutdown/feathering etc.) shall be kept to a minimum. Normal operation
with the CONDITION LEVER LOW IDLE shall be avoided. It is the operator s responsibility to maintain PROP
RPM at or above 1000 RPM. Various ambient conditions may result in a PROP RPM <1000 (adverse winds, LOW
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