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UH-1Y Limits and EPs > UH-1Y Ops Limits > Flashcards

UH-1Y Ops Limits Flashcards

1
Q

Main Rotor Limits (Power On)

A

Transient Operation: 91%
Continuous Operation: 97-100%
Transient Operation (10 sec): 100-110%

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2
Q

Main Rotor Limits (Power Off)

A 
Transient Operation (at 1g): 84%
Continuous Operation: 91-105%
Transient Operation (10 sec): 105-110%
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3
Q

Power Turbine Speed (Np) Limits

A 
Continuous Operation: 99-100%
Transient Operation (12 sec limit): 100-117%
Avoid Range: 55-70%
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4
Q

Engine Torque Limits (inner scale)

A

Continuous Operation: 0-61.9%

One Engine Inoperative (2.5 min limit): 61.9-65.7%

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5
Q

Main Rotor Gearbox Torque Limits (outer scale)

A 
Continuous Operation: 10-100%
Transient Operation (10 sec): 100-105%
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6
Q

MGT Limits (Normal Operation)

A 
Continuous Operation: 400-800C
Intermediate Operation (30 min limit): 801-867C
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7
Q

MGT Limits (One Engine Inoperative)

A 
Contingency Power (2.5 min): 868-917C
Transient Operation (12 sec): 917-964C
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8
Q

MGT Limits (Starting)

A

Maximum: 867C

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9
Q

Gas Generator Turbine Speed (Ng) Limits

A

Continuous Operation: 0-102.1%
Transient Operation (12 sec limit): 102.1-105.1%
Maximum: 105.2%

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10
Q

Engine Oil Temperature Limits

A

Continuous Operation: 35-131C
30 Minute Operation: 132-149C
Maximum: 150C

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11
Q

Engine Oil Pressure Limits

A 
Minimum: 20 PSI
Caution Range: 20-30 PSI
Continuous Operation: 30-100 PSI
Maximum: 100 PSI
Cold Start Maximum Limit: 200 PSI
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12
Q

MRGB Oil Temperature Limits

A

Caution: (-50)-(0)C
Normal: 0-100C
Caution Range: 100-110C
Maximum: 110C

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13
Q

MRGB Oil Pressure Limits

A 
Minimum: 25 PSI
Caution Range: 25-40 PSI
Normal: 40-70 PSI
Caution Range: 70-100 PSI
Maximum: 100 PSI
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14
Q

MRGB Oil Level Limits

A

LO: Requires Servicing
GO: Normal Operating Level

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15
Q

IGB Oil Temperature Limits

A

Caution: (-50)-(0)C
Normal: 0-124C
Caution Range: 124-129C
Maximum: 129C

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16
Q

IGT Oil Pressure Limits

A

LO: Low
GO: Normal (>7 PSI)

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17
Q

CBOX Oil Temperature Limits

A

Caution: (-50)-(0)C
Normal: 0-100C
Caution Range: 100-110C
Maximum: 110C

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18
Q

CBOX Oil Pressure Limits

A 
Minimum: 25 PSI
Caution Range: 25-70 PSI
Normal: 70-90 PSI
Caution Range: 90-150 PSI
Maximum: 151 PSI
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19
Q

Tail Rotor Gearbox Oil Temperature Limits

A

Caution: (-50)-(0)C
Normal: 0-100C
Caution Range: 100-110C
Maximum: 110C

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20
Q

Hydraulics Temperature Limits

A 
Minimum: (-7)C
Caution Range: (-7)-10C
Normal: 10-110C
Caution Range: 110-115C
Maximum: 115C
21
Q

Hydraulics Pressure Limits

A 
Minimum: 2000 PSI
Caution Range: 2001-2700 PSI
Normal: 2700-3150 PSI
Caution Range: 3150-3850 PSI
Maximum: 3850 PSI
22
Q

Hydraulics Fluid Level Limits

A

Minimum: LOW (75 CU. IN.)
Caution: REFL (75-85 CU. IN.)
Normal: FULL (85-110 CU. IN.)

23
Q

Main Generator Amperage Limits

A

Normal: 0-400 AMPS
Caution Range: 400-600 AMPS
Maximum: 600 AMPS

24
Q

Battery Limits

A 
Minimum: 18 VDV
Caution Range: 18-22 VDC
Normal: 22-29 VDC
Caution Range: 29-30 VDV
Maximum: 30 VDC
25
Q

APU Generator Voltage Limits

A 
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
26
Q

APU Generator Amperage Limits

A

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

27
Q

Essential and Nonessential DC Bus Limits

A 
Minimum: 18 VDV
Caution Range: 18-22 VDC
Normal: 22-29 VDC
Caution Range: 29-30 VDV
Maximum: 30 VDC
28
Q

Essential and Nonessential AC Bus Limits

A 
Minimum: 104 VAC
Caution Range: 104-108 VAC
Normal: 108-118 VAC
Caution Range: 118-125 VAC
Maximum: 125 VAC
29
Q

APU Starter Limitations

A 
30 seconds ON
60 seconds OFF
30 seconds ON
60 seconds OFF
30 seconds ON
30 minutes OFF
30
Q

Altitude Limitations

A

The maximum operational altitude is 10,000 feet pressure altitude

31
Q

Main Generator Voltage Limits

A 
Minimum: 18 VDV
Caution Range: 18-22 VDC
Normal: 22-29 VDC
Caution Range: 29-30 VDV
Maximum: 30 VDC
32
Q

Maximum Airspeed

33
Q

Maximum Autorotation Airspeed

34
Q

Max Sideward/Readward Flight

35
Q

SCAS Failure Max Airspeed

36
Q

Cabin Doors Opening/Closing Airspeed

37
Q

Max Cabin Doors Open Airspeed

38
Q

Max Airspeed Forward Wing Doors Open

39
Q

APU Ground Power Cart Limits

A 
500 AMPS (300-1000 min/max)
28 VDC (23.9-29.1 min/max)
40
Q

Abort Start Criteria

A
  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.
41
Q

Rotor Brake Limits

A
  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.
42
Q

Landing Gear Limits

A

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

43
Q

Prohibited Maneuvers

A
  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.
44
Q

External Cargo Limits

A

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.
45
Q

Rescue Hoist Weight Limits

A

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.

46
Q

Prohibited Operations

A
  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.
47
Q

Temperature Limits

A

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

48
Q

Blade Fold or Spread Limitations

A

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.

49
Q

Tail Rotor Gearbox Oil Pressure Limits

A

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

UH-1Y Limits and EPs (2 decks)

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