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HTs > Limits > Flashcards

Limits Flashcards

1
Q

Nf RPM

A

POWER ON: Minimum Nf is 97 percent. Maximum continuous Nf is 100 percent. Nf overspeeds are determined on a sliding scale depending on TOT, Nf percentage, and duration.

AVOID RANGE (STEADY STATE OPERATION): A 71 to 88 percent Nf steady state speed avoidance range is required for all operational practices. Flight in this range in excess of allowable transient limits requires turbine replace and shall be avoided. Any instance of such operation shall be recorded on a MAF to ensure documentation and shall include duration.

Notes:
1) Transient operation is defined as not remaining at a Nf speed of more than one second duration.
2) Consideration must be taken when practicing fixed pitch in a hover and low RPM recovery procedures.
3) Transient operation only is permitted in the speed avoidance range. Any exposure in the speed avoidance range must be minimized as much as possible. This limit applies to all flight and ground maintenance operational practices (including track and balance), except as noted below.
- During pretakeoff checks when rotating the twist frip to 70% Ng or full open is unrestricted, however, Nf should not purposely stabilize in the avoidance range.
- In an autorotation, with Nf split from Nf and throttle in the IDLE position, unrestricted operation within the speed avoidance range is permitted. Transient operation the speed avoidance range during recovery from autorotation is permitted.

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2
Q

Ng RPM

A

Idle gas producer (Ng) rpm is 62 +- 2 percent. The normal operating range is from 60 to 105 percent. A maximum transient of 106 % is allowed for 15 seconds.

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3
Q

Engine Oil Pressure

A

Minimum engine oil pressure is 50 psi with Ng below 79 percent. Minimum engine oil pressure with Ng between 79 and 94 percent is 90 psi. With Ng above 94 percent, the minimum engine oil pressure is 115 psi. Maximum engine oil pressure is 130 psi, except for temporary conditions up to 150 psi maximum immediately following a cold-weather start.

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4
Q

Engine Oil Temperature

A

Engine oil temperature limits are 0-107 degrees C

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5
Q

Rotor Engagement/Disengagement Wind Limitations

A

Up to 40 kts front 45, up to 25 knots both side 45s, up to 17 knots from back 45

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6
Q

Turbine Outlet Temperature

A

During Start
Up to 810 degrees - No limit
810-927 degrees - 10 seconds maximum
927 degrees - Maximum

During Power Transient
Up to 738 degrees - No limit
738-810 degrees - 5 minutes
810-843 degrees - 6 seconds
843 degrees - Maximum

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7
Q

Fuel

A

To avoid fuel freezing, do not allow indicated OAT in flight to dwell at or below the freeze point of fuel type in use. Increase airspeed and/or decrease altitude to maintain indicated OAT above the specific fuel freeze point. Minimum fuel reserve requirement for the TH-57B/C is 10 gallons.

Caution: Airframe and engine fuel filters may become blocked if fuel is chilled below its specific freeze point.

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8
Q

Rotor Limitations

A

POWER ON: Minimum Nr is 97 %. Maximum continuous Nr is 100 %

POWER OFF: The normal operating range is 90-107 %

Caution: Continuous operation in the 50-60 % Nr range may cause isolation mount damage.

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9
Q

Transmission Oil System Limits

A

Transmission oil pressure limits are 30-50 psi for continuous operation. Minimum oil pressure is 30 psi and maximum is 70 psi. Pressure indications between 50-70 psi shall be documented on a MAF upon completion of flight. Oil temperature limits are 15-110 degrees C. Check the transmission oil pressure with the twist grip full open.

Note:
1) Illumination of the TRANS OIL PRESS caution light is common while the twist grip is at flight idle, however, the gauge should indicate positive transmission oil pressure.
2) There is no detrimental effect to the transmission system with oil pressure between 50-70 psi with the transmission temperature within limits.

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10
Q

Torque

A

Maximum continuous torque is 85 %. Military power limit is 100 % for 5 minutes. Transient torque of 100-110 % is allowed for 5 seconds.

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11
Q

Fuel Pressure (Indicated)

A

Allowable fuel boost pump pressure is 4-30 psi.

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12
Q

Standby Generator Limitations (C)

A

Note: With main generator on, the standby generator loadmeter should indicate 10 % load or less. Momentary testing of standby generator under full bus load is permitted on the ground or in the air.

Prolonged operation of the standby generator while it is the primary power supply to the essential No. 1 bus is prohibited at speeds below 65 KIAS.

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13
Q

Rotor Brake Limitations

A

Rotor brake should be applied between 38-30 % Nr during normal operations.

Caution: Application of rotor brake below 30% Nr may cause damage to the drivetrain.

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14
Q

Starter Limitations

A

Limit Starter energizing time to the following:

Note: If a light off occurs within the first 20 seconds of the start sequence, the starter may be operated for 60 seconds with a 60 second cooling period. Three such attempts can be made in a 30 minute period, then wait 30 minutes to allow the starter to cool.

External Power:
25 seconds On
30 seconds Off
25 seconds On
30 seconds Off
25 seconds On
30 minutes Off

Battery:
40 seconds On
60 seconds Off
40 seconds On
60 seconds Off
40 seconds On
30 minutes Off

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15
Q

Airspeed Limits

A

Note: All airspeed values are calibrated airspeed except when indicated airspeed is specifically stated.

  1. Vne FCS OFF - 130 KIAS, FCS ON - 122 KIAS
    (refer to figure 4-4 or 29-3 for Vne reductions based on GW and DA)
  2. Sideward/Rearward flight

DA/Max sideward knots/Max rearward knots

0-1000/25/15
1-2/20/15
2-4/15/15
4-6/10/10
6-10/5/5

  1. Maximum rate of climb - 50 KIAS
  2. Minimum IFR speed (Vmini) - 65 KIAS
  3. Maximum airspeed with any combination of doors off - 110 KIAS
  4. Maximum autorotational airspeed is 100 KIAS
  5. Turbulence penetration airspeed is 80 KIAS
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16
Q

Altitude Limitations

A

Maximum operating altitude:

FCS OFF: 3000 pound gross weight and below - 20,000 ft PA; 18,000 ft DA

Above 3000 pound gross weight - 16,000 ft PA; 13,000 ft DA

IFR or FCS ON: 3000 pound gross weight and below - 11,500 ft PA; 13,500 ft DA

Above 3000 pound gross weight - 8,500 ft PA; 11,000 ft DA

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17
Q

Climb/Descent Limits

A

Climb and descent rates during flight in IMC conditions should not exceed 1,000 fpm

18
Q

Acceleration Limits

A

Acceleration limits are positive 2.5 Gs and positive 0.5 Gs

19
Q

Weight Limitations

A

Maximum gross weight internally is 3,200 pounds. Maximum gross weight including external cargo is 3,350 pounds

20
Q

Weight and CG limits

A

Center of gravity limits are shown in Figure 4-5. The shaded area of the charts indicates conditions where use of FCS is prohibited.

The basic aircraft envelope may be used if all actuator position indicators are centered and FCS circuit breakers are pulled.

21
Q

Longitudinal Center of Gravity Limits

A
  1. Cg limits with FCS OFF are from station 106.0 to 114.2
  2. Cg limits with FCS ON are from station 106.75 to 112.5
  3. Cg limits with front doors removed are from station 106.0 to 110.0
  4. The aft limit varies, depending on gross weight, for all operations
  5. Refer to Figure 4-5 for lateral and longitudinal Cg limits.

Note: Lateral Cg limits exist, however, all allowable configurations fall within these limits.

22
Q

Minimum Crew Requirements

A
  1. The minimum flightcrew consists of one pilot and a qualified observer.
  2. The minimum flighcrew for IFR operations is two pilots, with at least one being an instrument rated pilot.
  3. The minimum flightcrew for Confined Area Landing and External Cargo Operations is one pilot, one qualified observer, and an aircrewman. No aircrewman required if both pilots are NATOPS qualified in model.
  4. The minimum crew weight is 180 pounds.
23
Q

Required Equipment for IMC flight

A

Operation in instrument meteorological conditions is prohibited in a TH-57B.

  1. Cyclic force trim system
  2. MINISTAB flight control system (pitch and roll)
  3. Main generator
  4. Standby generator
  5. Battery protection circuit
  6. Instantaneous vertical speed indicator
  7. Two attitude indicators (one automatically powered by approved standby battery source in the event of power loss)
  8. One operable communication system
  9. One operable navigation system appropriate to the routes to be flown
  10. Radar altimeter
  11. Other equipment as required by the operating rules
24
Q

Prohibited Operations

A

The TH-57B is prohibited from operating IMC or in icing conditions.

The TH-57C is prohibited from operating in icing conditions.

IFR operations are prohibited with any doors removed or with an external load.

Asymmetrical doors off flight prohibited.

25
Q

Prohibited Manuevers

A

The following are prohibited in flight maneuvers:

  1. Aerobatic maneuvers.
  2. Protracted operations in the AVOID and CAUTION areas of the hieght velocity diagram.
  3. Fully developed vortex ring state.
  4. Intentional entry into blade stall.
  5. Hovering turns exceeding a rate of 45 degrees per second.
26
Q

Required Equipment for Night Flight

A
  1. All instrument and circuit breaker panel lights.

With the faulure of a single instrument guage backlight, night flight is authorized provided the gauge can be illuminated by existing cockpit and/or personal lighting or if a redundant gauge is fully functional (e.g. only one of two VSI gauge backlights is inoperative).

  1. All exterior lights
  2. Operable communication radio
  3. Attitude gyro
  4. Radar altimeter
27
Q

Required Equipment for Over Water and Shipboard Operations

A
  1. Radar Altimeter
  2. Vertical Speed Indicator

Note: Due to weight and space restrictions associated with the TH-57, liferafts are not required.

28
Q

ENG OIL TEMP gauge

A

0-107 Green
107 Red

29
Q

ENG OIL PRESSURE Gauge

A

50-90 Yellow
90-115 Green (Single Wide Arc)
115-130 Green (Double Wide Arc)
50 psi, 130 psi Red

30
Q

TRANSMISSION OIL PRESSURE Gauge

A

30-50 Green
30 psi, 70 psi Red

31
Q

TRANSMISSION OIL TEMPERATURE Gauge

A

15-110 Green
110 Red

32
Q

LOADMETER Gauge

33
Q

FUEL PRESSURE Gauge

A

4.0 Red
4.0-30.0 Green

34
Q

AIRSPEED Gauge

A

0-130 Green
130 Red
100 Blue

35
Q

FUEL QUANTITY Gauge

A

1.03 Gallons/Empty Red

36
Q

TORQUE Gauge

A

0-85 Green
85-100 Yellow
100 Red

37
Q

TOT Gauge

A

100-738 Green
738-810 Yellow
810 Red line
843 Red Octagon
927 Red Triangle

38
Q

GAS PRODUCER Gauge

A

60-105 Green
105 Red

39
Q

DUAL TACH POWER TURBINE Gauge

A

97 Red
97-100 Green
100 Red

40
Q

DUAL TACH ROTOR Gauge

A

50-60 Yellow
90 Red
90-107 Green
107 Red

HTs (2 decks)

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