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UC-12F > Operating Limits > Flashcards

Operating Limits Flashcards

1
Q

Autopilot Limitations (5)

A
  1. During autopilot operations, a pilot must be seated at the controls with seatbelt fastened.
  2. The autopilot shall not be used with flaps past the APPROACH position.
  3. The minimum altitude for engaging the autopilot is as follows:
    a. Takeoff – 400 feet AGL.
    b. Cruise – 1000 feet AGL.
    c. Approach – 200 feet AGL.
  4. The minimum altitude for yaw damper engagement is 200 feet AGL.
  5. Autopilot disengagement check shall be conducted and found satisfactory prior to each flight on which the
    autopilot is to be used.
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2
Q

Starter Limitations

A

The starters in this aircraft are limited to an operating period of 40 seconds on, then 60 seconds off, for two cycles. On the third cycle, after 40 seconds on, the starter shall have a cooling period of 30 minutes off.

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3
Q

Generator Limitations

A

Maximum sustained generator load is limited as follows:
1. Sea level to FL 310 — 100 percent.
2. Above FL 310 — 88 percent.
3. Ground operation — 85 percent.

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4
Q

GENERATOR LOAD (PERCENT) MINIMUM GAS GENERATOR RPM N1 (PERCENT)

A

70 to 75 - 56% N1
75 to 80 - 60% N1
80 to 85 - 65% N1

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5
Q

Propeller Limitations

A

Propeller limitations consist of rpm limits. The normal propeller operating range (green arc) extends from 1,600 to 2,000 rpm, with a red line at 2,000 rpm.

WARNING - Propeller operation between 1,750 to 1,850 rpm during ILS approach may result in glideslope signal interference.

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6
Q

Landing Gear Limitations

A

Landing gear shall not be cycled to exceed 10 complete cycles (extensions and retractions) equally spaced within a 1-hour period and shall not complete a full cycle within a 1-minute period.

CAUTION - Cycling the landing gear in excess of the above limits can cause the landing gear remote circuit breaker to activate and cause failure of the hydraulic power pack motor.

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7
Q

Fuel Management (6)

A
  1. Takeoff is prohibited if either fuel quantity gauge indicates in the yellow arc or less than 265 pounds of fuel.
  2. Operation with the fuel pressure light illuminated is limited to 10 hours between engine driven fuel pump overhaul or replacement periods.
  3. Operation on aviation gasoline is limited to 150 hours during any one engine overhaul period.
  4. Auxiliary tanks shall not be filled unless the main tanks are full.
  5. Maximum fuel imbalance between fuel systems is 1,000 pounds.
  6. Crossfeed — Refer to Part V, Emergency Procedures, for crossfeed limitations.
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8
Q

Fuel Capacity

A

The total fuel system capacity is 549 U.S. gallons, of which 544 U.S. gallons are usable. A 3 percent maximum error may be encountered in the fuel gauging system.

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9
Q

Brake Deice Limitations (3)

A
  1. Do not operate longer than 10 minutes (one timer cycle) with the landing gear retracted.
  2. A minimum of 85 percent N1 should be maintained during simultaneous use of surface and brake deice
    systems. If adequate pneumatic pressure cannot be provided for simultaneous use of both systems, use of the brake deice may be limited.
  3. Do not use system during single-engine operation or if pneumatic pressure is being supplied by a single bleed air source.

WARNING - If an engine failure should occur during brake deice system operation, the rudder boost system may not operate. Increased rudder pedal forces should be anticipated until the brake deice system is turned off.

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10
Q

Surface Deice Boot Temperature Limitation

A

Operation of the surface deice boots in temperatures below -40 °C (-40 °F) could result in permanent damage to the
boots.

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11
Q

Brake Deice Limitations

A

The brake deice system should not be operated at ambient temperatures above +15 °C (59 °F).

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12
Q

Ice Vane (Inertial Separator System) Limitations

A

The ice vanes shall be extended for operations in ambient temperatures of +5 °C (41 °F) or below when flight free of visible moisture cannot be assured. The ice vanes shall be retracted for operations in ambient temperatures of +15 °C (59 °F) or above.

NOTE - The actual Outside Air Temperature (OAT) may be up to 8 °C less than
indicated (IOAT).

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13
Q

Maximum Ramp and Taxi Weight

A

Normal Category — 12,595 lb
Restricted Category — 13,595 lb

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14
Q

Maximum Takeoff Weight

A

Normal Category Takeoff — 12,500 lb
Restricted Category Takeoff — 13,500 lb

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15
Q

Maximum Landing Weight

A

12,500 lb

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16
Q

Max zero fuel weight

A

11,000 lb

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17
Q

Airstair Door Limitations

A

300 lbs

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18
Q

Maximum operating speed, VMO

A

259 KIAS.

NOTE - VMO decreases approximately 5 knots for each 1,000 feet of altitude above 15,000 feet.

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19
Q

Minimum safe single-engine speed, VSSE

A

104 KIAS

20
Q

Maximum speed with flaps APPROACH

A

200 KIAS

21
Q

Maximum speed with flaps DOWN

A

157 KIAS

22
Q

Maximum gear retraction speed (VLO)

A

163 KIAS

23
Q

Maximum gear extension/extended speed (VLE)

A

181 KIAS

24
Q

Maximum design maneuvering speed flaps UP

A

181 KIAS

25
Q

Maximum design maneuvering speed flaps DOWN

A

111 KIAS

26
Q

Maximum Tire Speed

A

139 KGS

27
Q

Turbulent Air Penetration Speed

A

170 KIAS

28
Q

Maximum operating altitude

A

35,000 FT

29
Q

Maximum operating altitude with aviation gasoline

A

Both standy boost pumps operative - 31,000 FT

Only one standby boost pump operative - 20,000 FT

30
Q

Maximum operating altitude with an unpressurized cabin

A

25,000 FT

31
Q

Maximum operating altitude with an inoperative yaw damp

A

17,000 FT

32
Q

Operation with cracked cabin window (inner or outer)

A

Unpressurized flight only

33
Q

Maximum cabin pressure differential

A

6.6 PSID

34
Q

Operation with cracked windshield, inner layer

A

4.0 PSID

35
Q

Operation with cracked windshield, outer layer

A

6.6 PSID

36
Q

Acceleration Limitations

A

3.17g positive, 1.27 negative in the clean configuration.

2.0g positive, 0.0 negative with flaps down.

37
Q

Prohibited Maneuvers (6)

A
  1. Abrupt control movement.
  2. Unusual g loading.
  3. Bank angle greater than 60° (normal category).
  4. Bank angle greater than 35° (restricted category).
  5. Pitch attitude more than 30° above or below the horizon.
  6. Intentional spins.
38
Q

Takeoff/Landing Limitations

A
  1. Only flared landings shall be performed.
  2. Maximum sink rate at touchdown — 300 fpm.
  3. Maximum cross wind component — 25 knots.
    a. Icy runway — 10 knots.
    b. Soft field — 5 knots.
  4. Maximum tailwind component — 10 knots.

CAUTION - Damage to the landing gear may result from the following:
1. Landing on arresting gear cables.
2. Braking during cable rollover.
3. Wheel contact with cable risers or boots.
4. Cable rollover above normal taxi speeds.

39
Q

Propeller Reversing

A

Do not move POWER levers aft of the flight idle position in flight.

WARNING - Moving the POWER levers below the FLIGHT IDLE position in flight may result in abrupt nose-down pitch and a descent rate leading to aircraft damage and injury to personnel.

40
Q

Engine Operating Limitations

Torque (ft-lbs)

A

Starting -
Low Idle -
High Idle -
Takeoff and Max Cont - 2230
Normal Cruise - 2230
Reverse -
Transient - 2230 to 2750 (5 sec)

Torque limit applies within range of 1,600 to 2,000 propeller rpm (N2). Below 1,600 rpm, torque is limited to 1,100 ft-lb.

41
Q

Engine Operating Limitations

ITT

A

Starting - 1000 C (5 sec)
Low Idle - 750 C
High Idle -
Takeoff and Max Cont - 800 C (770 recommended)
Normal Cruise - 770 C
Reverse - 750 C
Transient - 800 to 850 C (5 sec)

High engine temperature at ground idle may be corrected by reducing accessory load and/or increasing N1 rpm.

42
Q

Engine Operating Limitations

N1

A

Starting -
Low Idle - 56 (min)
High Idle - ~70
Takeoff and Max Cont - 101.5
Normal Cruise - 101.5
Reverse - 88
Transient - 101.6 to 102.6 (10 sec)

43
Q

Engine Operating Limitations

N2

A

Starting -
Low Idle -
High Idle -
Takeoff and Max Cont - 2000
Normal Cruise - 2000
Reverse - 1900
Transient - 2000 to 2200 (5 sec)(torque limited to 1800 ft-lbs > 2000 RPM)

44
Q

Engine Operating Limitations

OIL PRESS

A

Starting -
Low Idle - 60 (min)
High Idle -
Takeoff and Max Cont - 100 to 135
Normal Cruise - 100 to 135
Reverse - 100 to 135
Transient -

When gas generator speeds are above 72 percent N1 normal oil pressures are:
a. 100 to 135 psi below 21,000 feet.
b. 85 to 135 psi at 21,000 feet and above.
c. During Engine starts in extremely low ambient air temperatures, oil pressure may reach 200 psi.
d. Oil pressure 60 to 85 psi (at and above 21,000 feet) and 60 to 100 psi (below 21,000 feet) is undesirable.
Refer to Paragraph 15.4 Oil/Fuel System Emergencies for operation with undesirable or unsafe oil pressure.
e. Allowable Oil Pressure Fluctuations are ±10 psi.

45
Q

Engine Operating Limitations

OIL TEMP

A

Starting - -40 (min)
Low Idle - -40 to 99
High Idle - -40 to 99
Takeoff and Max Cont - 0 to 99
Normal Cruise - 0 to 99
Reverse - 0 to 99
Transient - 100 to 104 (5 min)

An engine oil temperature of 74 to 80 °C is recommended. A minimum oil temperature of 55 °C is recommended for fuel heater operation at takeoff power.

UC-12F (6 decks)

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