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Navy Flight School: Helo Advanced > TH-57B/C Limits > Flashcards

TH-57B/C Limits Flashcards

1
Q

Minimum Nf RPM

A

97%

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2
Q

Maximum Nf RPM

A

100%

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3
Q

Nf Avoid Range for Steady State Operation

A

71 - 88% Nf

Steady-State is defined as not remaining at Nf speed of more than one second duration

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4
Q

Nf overspeeds are determined on a sliding scale depending on ____, ____, and ____.

A
  • Turbine Outlet Temperature (TOT)
  • Nf percentage
  • Duration
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5
Q

Idle Range Ng RPM

A

62 ± 2% Ng

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6
Q

Normal Range Ng RPM

A

60 - 105% Ng

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7
Q

Max Transient Ng % RPM

A

106% for 15secs

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8
Q

Engine Oil Pressure

Depending on the Ng Range

A
  • 50psi (minimum) when Ng is below 79%
  • 90psi (minimum) when Ng is 79 - 94%
  • 115psi (minimum) when Ng is above 94%
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9
Q

Max Engine Oil Pressure

A

130psi

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10
Q

Transient Max Engine Oil Pressure Following Cold WX Start

A

150psi

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11
Q

Engine Oil Temperature

A

0° - 107°C

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12
Q

Rotor Engagement/Disengagement Wind Limits - Headwind

A

40kts max

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13
Q

Rotor Engagement/Disengagement Wind Limits - Crosswind

A

25kts max

Crosswind is considered 45° foreward/aft of abeam

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14
Q

Rotor Engagement/Disengagement Wind Limits - Tailwind

A

17kts max

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15
Q

TOT Limits During Start

A
  • Up to 810°C with no time limit
  • Between 810° - 927°C for 10secs
  • 927°C Maximum
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16
Q

TOT Limits During Transient Power

A
  • Up to 738°C with no time limit
  • Between 738° - 810°C for 5mins
  • Between 810° - 843°C for 6secs
  • 843° Maximum
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17
Q

Minimum Fuel Reserve Requirement

A

10 gallons

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18
Q

Nr Power On Minimum

A

97%

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19
Q

Nr Power On Maximum

A

100%

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20
Q

Nr Power Off Normal Operating Range

A

90 - 107% Nr

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21
Q

At what Nr continuous operating range would there be isolation mount damage?

A

50 - 60% Nr

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22
Q

Minimum Transmission Oil Pressure

A

30psi

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23
Q

Maximum Transmission Oil Pressure

A

70psi

24
Q

Continuous Operation Range for Transmission Oil Pressure

A

30 - 50psi

25
Q

Transmission Oil Temperature

A

15° - 110°C

26
Q

Max Continuous Torque

A

85%

27
Q

Military Power (Torque)

A

85-100% TRQ for 5mins

28
Q

Transient Torque

A

100 - 110% TRQ for 5secs

29
Q

Fuel Pressure

A

4 - 30psi

30
Q

What is the limiting factor on the standby generator?

A

Prolonged operations (when it is the primary power supply to the Essential No. 1 bus) is prohibited at speeds below 65 KIAS

31
Q

When and at what Nr percent should rotor brakes be applied?

A

During normal operations, the rotor brake should be applied between 38 - 30%

32
Q

Application of the rotor brake below what Nr percent may cause damage to the drivetrain?

A

30% Nr

33
Q

Starter Limits (External Power)

A
  • 25 seconds - ON
  • 30 seconds - OFF
  • 25 seconds - On
  • 30 seconds - OFF
  • 25 seconds - ON
  • 30 mins - OFF

Three attempted starts with a 30min cooldown after the last attempted start

34
Q

Starter Limits (Battery)

A
  • 40 seconds - ON
  • 60 seconds - OFF
  • 40 seconds - On
  • 60 seconds - OFF
  • 40 seconds - ON
  • 30 mins - OFF

Three attempted starts with a 30min cooldown after the last attempted start

35
Q

If light-off occurs within the first ____ seconds of the start sequence, the starter may be
operated for ____ seconds with a _______-__________ cooling period. Three such attempts
can be made in a ____- minute period, then wait ____ minutes to allow the starter to
cool.

A
  • Light-off occurs within the first 20 seconds
  • Operated for 60sec with a 60sec cooling period
  • Made in a 30min period then wait 30mins
36
Q

Max Internal Gross Weight

A

3200 lbs

37
Q

Max Gross Weight Including External Cargo

A

3350 lbs

38
Q

Acceleration Limits

A

Positive 2.5 to 0.5 G’s

At max gross weight

39
Q

Airspeed Limits (0-1000’ DA)

A
  • Max Sidewards: 25kts
  • Max Rearward: 15kts
40
Q

Airspeed Limits (1000 - 2000’ DA)

A
  • Max Sidewards: 20kts
  • Max Rearward: 15kts
41
Q

Airspeed Limits (2000 - 4000’ DA)

A
  • Max Sidewards: 15kts
  • Max Rearward: 15kts
42
Q

Airspeed Limits (4000 - 6000’ DA)

A
  • Max Sidewards: 10kts
  • Max Rearward: 10kts
43
Q

Airspeed Limits (6000- 10,000’ DA)

A
  • Max Sidewards: 5kts
  • Max Rearward: 5kts
44
Q

Max Rate of Climb Airspeed

A

50 KIAS

45
Q

Minimum IFR Speed

A

65 KIAS

46
Q

Max Airspeed With Any Combination of Doors Off

A

110 KIAS

47
Q

Max Autorotational Airspeed

A

100 KIAS

48
Q

Turbulence Penetration Speed

A

80 KIAS

49
Q

Altitude Limitations (FCS OFF)

A

If Gross Weight = less than 3000lbs:
* 20,000’ (Pressure Altitude)
* 18,000’ (Density Altitude)

If Gross Weight = more than 3000lbs:
* 16,000’ (Pressure Altitude)
* 13,000’ (Density Altitude)

50
Q

Altitude Limitations (FCS ON or IFR)

A

If Gross Weight = less than 3000lbs:
* 11,500’ (Pressure Altitude)
* 13,500’ (Density Altitude)

If Gross Weight = more than 3000lbs:
* 8,500’ (Pressure Altitude)
* 11,000’ (Density Altitude)

51
Q

Max Climb and Descent Rates in IFR

A

1000 fpm

52
Q

Center of Gravity Limit (FCS ON)

A

From station 106.75 to 112.5

53
Q

Center of Gravity Limit (FCS OFF)

A

From station 106.0 to 114.2

54
Q

Center of Gravity Limit (Front Doors Removed)

A

From station 106.0 to 110.0

55
Q

Prohibited Operations

A
  • TH-57B - Operating in IMC/Icing conditions
  • TH-57C - Operating in icing conditions
  • IFR operations with any doors removed or external load
  • Asymmetrical doors-off flight
56
Q

Prohibited Maneuvers

A
  1. Aerobatic maneuvers
  2. Protracted operations in the AVOID and CAUTION areas of the height-velocity diagram
  3. Fully developed vortex ring state
  4. Intentional entry into blade stall
  5. Hovering turns more than 45° per second
57
Q

Required Equipment for Night Flight

A
  1. All instrument and circuit breaker panel lights
  2. All exterior lights
  3. Operable communication radio
  4. Attitude gyro
  5. Radar altimeter

Navy Flight School: Helo Advanced (13 decks)

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