-54° -32° Unlimited --
(-65° -90°)
33°-38° 24 72
(91° -100°)

39°-52° 16 48
(102° -126°)
5.30 APU OPERATING LIMITATIONS.
To prevent APU overheating, APU operation at ambient temperature of 43°C (109°F) and above with engine and rotor operating, is limited to 30 minutes. With engine and rotor not operating, the APU may be operated continuously up to an ambient temperature of 51°C (124°F).
5.31 WINDSHIELD ANTI-ICE LIMITATIONS.
Windshield anti-ice check shall not be done when FAT is over 21°C (70°F).
5.32 TURBULENCE AND THUNDERSTORM OPERATION.
a.
Intentional .ight into severe turbulence is prohibited.

b.
Intentional .ight into thunderstorms is prohibited.

c. Intentional .ight into turbulence with a sling load at-tached and an inoperative collective pitch control friction is prohibited.
Section VIII OTHER LIMITATIONS
5.33 EXTERNAL EXTENDED RANGE FUEL SYS-TEM KIT CONFIGURATIONS.
The ERFS kit shall only be utilized with a 230-gallon tank installed on each outboard vertical stores pylon.
5.34 JETTISON LIMITS.
a.

The jettisoning of fuel tanks in other than an emergency is prohibited.

b.

The recommended external fuel tank jettison en-velope is shown in Table 5-1.

5.35 GUST LOCK LIMITATIONS. NOTE
Before engine operations can be performed with the gust lock engaged, all main rotor tie downs shall be removed.

a.
Dual-engine operation with gust lock engaged is pro-hibited.

b.
Single-engine operation with gust lock engaged will be performed by authorized pilot(s) at IDLE only. Gust lock shall not be disengaged with engine running.

5.36 RESCUE HOIST LIMITATIONS.
Refer to Airworthiness Release from U. S. Army Aviation and Missile Commend for limitations.
5.37 CARRY ON MEDICAL EQUIPMENT LIMITA-TIONS.
Refer to Airworthiness Release from U. S. Army Aviation and Missile Commend for limitations.
5.38 MAINTENANCE OPERATIONAL CHECKS (MOC).
Whenever a MOC requires that engines be started, pilots performing the MOCs must be authorized by the com-mander, trained and quali.ed in accordance with aircrew training manual (ATM), (TM 55-1500-328-23), DA PAM 738-751, and local standard operating procedures (SOP). The MOCs must be performed with checks enumerated in the maintenance test .ight manual (MTF) or the -23 series maintenance manuals.

Table 5-1. Recommended Emergency External Fuel Tank Jettison Envelope
RECOMMENDED EMERGENCY JETTISON ENVELOPE 
LEVEL FLIGHT  AIRSPEED KIAS 
0 TO 120  120 TO Vh 
SLIP INDICATOR DISPLACED NO MORE THAN ONE BALL WIDTH LEFT OR RIGHT  NO SIDESLIP BALL CENTERED 
DESCENT  *JETTISON BELOW 80 KIAS NOT RECOMMENDED  AIRSPEED KIAS  *JETTISON ABOVE 120 KIAS NOT RECOMMENDED 
80  90  100  110  120 
1000  875  750  625  500 
MAX RATE OF DESCENT FT/MIN 
*Not recommended because safe jettison at these conditions has not been veri.ed by tests. 

Change 2 5-17/(5-18 Blank)

CHAPTER 6

WEIGHT/BALANCE AND LOADING

Section I GENERAL
6.1 INTRODUCTION.
This chapter contains instructions and data to compute any combination of weight and balance for this helicopter, if basic weight and moment are known.
6.2 CLASS.
Army helicopters de.ned in this manual are in Class 2. Additional directives governing weight and balance of Class 2 aircraft forms and records are contained in AR 95 series, TM 55-1500-342-23, and DA PAM 738-751.
6.3 HELICOPTER COMPARTMENT AND STATION DIAGRAM.
　
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