Chapter 5

Question 1

Airspeed Operating Limits

Answer 1

130 KIAS = Maximum airspeed for one engine inoperative.

130 KIAS = Maximum airspeed for autorotation at a gross weight of greater than 16,825 pounds.

150 KIAS = Maximum airspeed for autorotation at a gross weight of 16,825 pounds or less.

Sideward/rearward flight into the wind, when combined with windspeed, shall not exceed 45 knots.

Question 2

Slope Landing Limitations

Answer 2

a. 15° nose-up, right wheel up or left wheel upslope. The slope limitations shall be further reduced by 2° for every 5 knots of wind.
b. 6° nose downslope. Landing in down slope conditions with tail winds greater than 15 knots shall not be conducted.
c. The main gearbox may be operated up to 30 minutes at a time with pressure fluctuations when the helicopter os known to be at a nose-up attitude.

Question 3

Airspeed Vne

Answer 3

Function of altitude, temperature, and gross weight.

(193 Knots)

Question 4

Flight in Ice

Answer 4

a. …… 4°C or below…… visible liquid moisture……
b. Helicopter with the following equipment installed, operational, and turned on are permitted to fly into trace or light icing conditions.
(1) Windshield Anti-ice
(2) Pitot Heat
(3) Engine Anti-Ice
(4) Engine Inlet Anti-Ice Modulation Valve
(5) Insulated Ambient Air Sensing Tube
c. Flight into moderate icing contions, all equipment in paragraph 5.28 b. and blade deice.

Flight into heavy or severe icing is prohibited.

Question 5

Main Transmission Oil Temperature Limits

Answer 5

Precautionary: 105 - 140°C

Continuous: -50 - 105°C

Question 6

Engine Oil Temperature

Answer 6

30-minute Limit: 135 - 150°C

Continuous: -50 - 135°C

Question 7

Engine Overspeed Check Limitations

Answer 7

Engine overspeed check in flight is prohibited. Engine overspeed checks,on the ground, are authorized by designated maintenance personnel only.

Question 8

Maximum airspeed for Searchlight

Answer 8

100 KIAS = Maximum forward airspeed for extending

180 KIAS = Airspeed limit if extended

Question 9

Engine Ng

Answer 9

12-Second Transient: 102%-105%

30-Minute Limit: 99%-102%

Continuous: 0-99%

Question 10

Fuel Quantity Gauge Limits

Answer 10

Normal: 200 - 1500 LBS

Precautionary: 0 - 200 LBS

Question 11

Turbine Gas Temperature Limits

Answer 11

12-Second Transient: 903-949°C

2.5 Minutes Transient (Contingency Power): 878-903°C

Start Abort Limit: 851°C

10-Minute Limit: 851-878°C

30-Minute Limit: 801-851°C

Normal: 0-810°C

Question 12

High-Speed Yaw Maneuver Limitation

Answer 12

Above 80 KIAS avoid abrupt, full pedal inputs to prevent excess tail rotor system loading.

Question 13

Airspeed Limitations Following Failure Of The Automatic Stabilator Control System

Answer 13

Manual control is available:

(1) Below 40 KIAS: The stabilator shall be set full down
(2) Above 40 KIAS: The stabilator shall be set at 0°
(3) 120 KIAS: Autorotation airspeed shall be limited at all gross weights.

Manual control not available:

The placard airspeed limits shall be observed as not-to-exceed speed (powered flight and autorotation), except in no case shall the autorotation limit exceed 120 KIAS.

Question 14

SAS inoperative airspeed limits

Answer 14

170 KIAS = One SAS inoperative

150 KIAS = Two SAS inoperative

140 KIAS = Two SAS inoperative in IMC

Question 15

Maximum airspeed for Landing Light

Answer 15

130 KIAS = Maximum forward airspeed for extending

180 KIAS = Airspeed limit if extended

Question 16

Pneumatic Source Inlet Limits

Answer 16

The minimum ground-air source (pneumatic) required to start the helicopter engines is 40 psig and 30 ppm at 149°C (300°F)

The maximum ground-air source to be applied to the helicopter is 50 psig at 249°C (480°F), measured at the external air connector on the fuselage.

Question 17

Bank Angle Limitation

Answer 17

Bank angles shall be limited to 30° when a PRI SERVO PRESS caution appears.

Question 18

Engine Starter Limits

Answer 18

a. …… 60 seconds between start attempts ……
b. At ambient temperatures of 15°C (59°F) and below, two consecutive start cycles may be made, followed by a 3-minute rest period, followed by two additional start cycles. A 30-minute rest period is the required before any additional starts.
c. At ambient temperatures above 15°C up to 52°C (59°F up to 126°F), two consecutive start cycles may be made. A 30-minute rest period is the required before any additional cycles.

Question 19

Hydraulic system inoperative airspeed limits

Answer 19

170 KIAS = One Hydraulic system inoperative

150 KIAS = Two Hydraulic systems inoperative

140 KIAS = Two Hydraulic systems inoperative in IMC

Question 20

Landing Speed Limitations

Answer 20

Maximum forward touchdown speed is limited to 60 knots ground speed on level terrain.

Question 21

Prohibited Maneuvers

Answer 21

a. Hovering turns greater than 30° per second are prohibited. Intentional maneuvers beyond attitudes of +/- 30° in pitch or over 60° in roll are prohibited.
b. Simultaneous moving of both ENG POWER CONT levers to IDLE or OFF (throttle chop) in flight is prohibited.
c. Rearward ground taxi is prohibited.

Question 22

Main Rotor Overspeed

Answer 22

* 127%

** 137%

*** 142%

Question 23

Engine Oil Pressure

Answer 23

5-Minute Limit: 100 - 120 PSI

Normal Operation: 26 - 100 PSI

Idle: 22-26 PSI

Question 24

Gust Lock Limitations

Answer 24

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

Question 25

Landing Gear Limitation

Answer 25

**Landing Gear Limitations** Do not exceed a touchdown sink rate: Gross weights of **up to** **16,825 pounds** **540 fpm** = on level terrain **360 fpm** = on slopes Gross weights **above 16,825 pounds** **300 fpm** = on level terrain **180 fpm** = on slopes

Question 26

Engine %RPM 1-2 Limits

Answer 26

12-Second Transient: 105%-107% Transient: 101%-105% Continuous: 95%-101% Transient: 91%-95% Avoid operations in 20%-40% and 60%-90% range except during start and shutdown

Question 27

Engine Start Limits

Answer 27

Cross bleed starts shall not be attempted unless the **#1 ENG ANTI-ICE ON** or **#2 ENG ANTI-ICE ON** advisory does not appear, and operating engine must be at **90% Ng SPEED** or above and rotor speed at **100% RPM R**. ......

Question 28

Loading Limits

Answer 28

Maximum capacity for each storage compartent is **125 pounds**. Maximum cargo hook capacity (UH-60L) is **9000 pounds**. Max weight for UH60 with seven lugs wheels is **20500 pounds**. Max weight is futher limited by cargo floor maximum capacity of **300 lbs** per square foot.

Question 29

Main Rotor %RPM R

Answer 29

**POWER ON** Transient: 101%-107% Continuous: 95%-101% Transient: 91%-95% **POWER OFF (AUTOROTATION)** Maximum: 110% Transient: 105%-110% Normal: 90%-105%

Question 30

Engine Torque Limits

Answer 30

**10-Second Transient** Dual-Engine Above 80 KIAS: 100%-144% 80 KIAS or Below: 120%-144% Single-Engine: 135%-144% **Continuous** Single-Engine: 0%-135% Dual-Engine Above 80 KIAS: 0%-100% 80 KIAS or Below: 0%-120%

Question 31

Turbulence and Thunderstorm operation

Answer 31

a. Intentional flight into **thunderstorms** is prohibited. b. Intentional flight into **severe** **turbulence** is prohibited. c. Intentional flight into turbulence with a **sling load** attached and an inoperative **collective pitch control friction** is prohibited.

Question 32

Backup Hydraulic Pump Hot Weather Limitations

Answer 32

Backup hydraulic pump hot weather limits with the rotor system **static**. ## Footnote FAT °C Operating Time Cool down time -54°-32° UNLIMITED -------- 33°-38° 24 MINUTES 72 MINUTES 39°-52° 16 MINUTES 48 MINUTES

Question 33

Main Transmission Oil Pressure Limits

Answer 33

Precautionary: 65 - 130 PSI Continuous: 30 - 65 PSI Idle and Transient: 20 - 30 PSI

Question 34

Main Transmission Module Limitations

Answer 34

If oil pressure is not steady during **steady state forward flight** or in a **level hover**, or if oil pressure is steady but under **45 psi** make an entry on DA Form 2408-13-1. Sudden pressure drop (**more than 10 psi**) without fluctuation requires an entry on DA Form 2408-13-1.

Question 35

Maneuvering Limitations | (note)

Answer 35

Maneuvers entered from a low power setting may result in **transient droop** of **5% RPM R** or greater.

Question 36

Rotor Start and Stop Limits

Answer 36

**45 knots** - Maximum wind velocity for rotor start and stop from any direction.

Question 37

APU Operating Limitations

Answer 37

To prevent APU overheating, the APU operation at ambient temperature of **43°C** and above with **engine and rotor operating**, is limited to **30 minutes**. With the **engine and rotor not operating**, the APU may be operated **continuously** up to an ambient temperature of **51°C**.

Question 38

Restricted Maneuvers

Answer 38

**Manual Operation of the Stabilator** Manual operation of the stabilator in flight is **prohibited** except as required by **formal training** and **maintenance test flight** requirements or as alternate stabilator control in case of **AUTO** mode malfunctions. **Downwind Hovering** Prolonged rearward flight and downwind hovering are to be avoided to prevent **exhaust fumes** in the helicopter and **heat damage** to windows on **open cargo doors**.

Question 39

Flight with Cabin Door(s)/Window(s) open

Answer 39

Cabin doors may be fully open up to **100 KIAS** with **soundproofing installed** aft of station 379. Cabin doors may be fully open up to **145 KIAS** with **soundproofing removed** af of station 379 or with **soundproofing secured** properly. The gunner's window(s) may be fully open up to **170 KIAS**. Cockpit doors sliding windows will not be **opened** or **closed** during flight except during **hover**. Flight with cockpit door(s) removed is **prohibited**.

Question 40

Windshield Anti-Ice Limitations

Answer 40

Windshield anti-ice check shall not be done when FAT is over **27°C** (80**°**F)

Question 41

Limitations for Maneuvering With Sling Loads

Answer 41

Maximum **30****°** angle of bank in forward flight. Side flight is limited by **bank angle** and is **decreased as airspeed increases**. Rearward flight with sling load os limited to **35 knots**.