UH-1Y Ops Limits Flashcards

Question

APU Generator Voltage Limits

Answer 1

``` Low: 0-17.9 VDC Avoid Range: 18-21.9 VDC Normal: 22-29 VDC Avoid Range: 29.1-29.9 VDC High: 30 VDC ```

Answer 2

Normal: 0-200 AMPS Avoid Range: 200.1-299 AMPS High: 300-400 AMPS

Answer 3

``` Minimum: 18 VDV Caution Range: 18-22 VDC Normal: 22-29 VDC Caution Range: 29-30 VDV Maximum: 30 VDC ```

Answer 4

``` Minimum: 104 VAC Caution Range: 104-108 VAC Normal: 108-118 VAC Caution Range: 118-125 VAC Maximum: 125 VAC ```

Answer 5

``` 30 seconds ON 60 seconds OFF 30 seconds ON 60 seconds OFF 30 seconds ON 30 minutes OFF ```

Answer 6

The maximum operational altitude is 10,000 feet pressure altitude

Answer 7

``` Minimum: 18 VDV Caution Range: 18-22 VDC Normal: 22-29 VDC Caution Range: 29-30 VDV Maximum: 30 VDC ```

Answer 8

``` 500 AMPS (300-1000 min/max) 28 VDC (23.9-29.1 min/max) ```

Answer 9

1. Ng fails to reach 14 percent within 6 seconds. 2. No MGT indication within 30 seconds after the starter engages. 3. Oil pressure is not evident within 30 seconds after starter is engaged. Do not motor engine if aborting due to lack of oil pressure. 4. MGT reaches 867 °C before starter disengages. 5. Starter fails to disengage above 55 ±3 percent Ng. 6. No Np within 30 seconds after Ng reaches idle (67 ±3 percent). 7. ROTOR BRAKE light fails to extinguish within 30 seconds after brake release.

Answer 10

1. Do not apply rotor brake above 60 percent Nr except for emergency situations. 2. Do not apply rotor brake below 25 percent Nr except in emergency situations. 3. Except in emergency situations, the rotor brake shall be released at approximately 10 percent Nr to avoid sudden stoppage. 4. During rotor brake start, release brake within 25 seconds after engine idleRPM(67 ±3 percentNg) is attained. 5. During rotor brake start, ROTOR BRAKE light should extinguish within 30 seconds after brake release. 6. Do not exceed engine idle RPM (67 ±3 percent Ng) with rotor brake engaged.

Answer 11

Landing is permitted at maximum gross weight for all headings on slope surfaces up to and including six degrees.

Answer 12

1. Aerobatic maneuvers as defined by OPNAVINST 3710.7 series. 2. Practice autorotations to touchdown are prohibited. 3. Practice autorotation entries within the shaded areas of the height velocity diagrams (Figure 4-2 and Figure 4-4) are prohibited. 4. Dual--engine throttle chops above 120 KIAS are prohibited. 5. Single--engine throttle chops above 60--percent MRGB torque are prohibited. 6. Do not exceed 50 percent MRGB torque at airspeeds above Vh while in a dive. 7. Abrupt, simultaneous collective and cyclic inputs while maneuvering are prohibited. 8. Continuous night--aided operation (with TopOwl HMSD) within NOE environment is prohibited. Transition through NOE is permitted.

Answer 13

The cargo hook weight limit is 4,000 pounds. 1. Airspeed limit for external cargo is 135 KIAS. 2. Maximum angle of bank during external cargo operations is 30 degrees.

Answer 14

The internal rescue hoist weight limit is 600 pounds. The retraction speed capability is 150 fpm at 600 pounds or 300 fpm at 300 pounds. The useable cable length is 250 feet.

Answer 15

1. Gravity Fueling: Gravity fueling with engines and/or APU operating is prohibited. 2. Minimum Fuel Requirement: No flight shall be planned to terminate with a fuel state less than 350 pounds. 3. Single Hydraulic System Flight: Except for emergencies, intentional in--flight operation with the HYD1 or HYD2 PBA selected to OFF is prohibited.

Answer 16

Helicopter operation at outside air temperatures below -25 °F (-32 °C) or above 125 °F (52 °C) is prohibited.

Answer 17

Blades should not be folded or spread in winds over 45 knots, from any direction. If blade pin-puller actuator motor stalls two consecutive cycles, allow 5-minute cool down period prior to recycling motor.

Answer 18

LO: Minimum (<10 PSI) GO: Normal (11-149 PSI) HI: Caution Range (150-174 PSI) HI: Maximum (>175 PSI)