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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

24
Q

Continuous Operation Range for Transmission Oil Pressure

A

30 - 50psi

25
Transmission Oil Temperature
15° - 110°C
26
Max Continuous Torque
85%
27
Military Power (Torque)
85-100% TRQ for 5mins
28
Transient Torque
100 - 110% TRQ for 5secs
29
Fuel Pressure
4 - 30psi
30
What is the limiting factor on the standby generator?
**Prolonged operations** (when it is the primary power supply to the Essential No. 1 bus) **is prohibited at speeds below 65 KIAS**
31
When and at what Nr percent should rotor brakes be applied?
During normal operations, the rotor brake should be applied between 38 - 30%
32
Application of the rotor brake below what Nr percent may cause damage to the drivetrain?
30% Nr
33
Starter Limits **(External Power)**
* 25 seconds - ON * 30 seconds - OFF * 25 seconds - On * 30 seconds - OFF * 25 seconds - ON * 30 mins - OFF ## Footnote Three attempted starts with a 30min cooldown after the last attempted start
34
Starter Limits **(Battery)**
* 40 seconds - ON * 60 seconds - OFF * 40 seconds - On * 60 seconds - OFF * 40 seconds - ON * 30 mins - OFF ## Footnote Three attempted starts with a 30min cooldown after the last attempted start
35
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.
* 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
Max Internal Gross Weight
3200 lbs
37
Max Gross Weight Including External Cargo
3350 lbs
38
Acceleration Limits
Positive 2.5 to 0.5 G's ## Footnote At max gross weight
39
Airspeed Limits **(0-1000' DA)**
* Max Sidewards: 25kts * Max Rearward: 15kts
40
Airspeed Limits **(1000 - 2000' DA)**
* Max Sidewards: 20kts * Max Rearward: 15kts
41
Airspeed Limits **(2000 - 4000' DA)**
* Max Sidewards: 15kts * Max Rearward: 15kts
42
Airspeed Limits **(4000 - 6000' DA)**
* Max Sidewards: 10kts * Max Rearward: 10kts
43
Airspeed Limits **(6000- 10,000' DA)**
* Max Sidewards: 5kts * Max Rearward: 5kts
44
Max Rate of Climb Airspeed
50 KIAS
45
Minimum IFR Speed
65 KIAS
46
Max Airspeed With Any Combination of Doors Off
110 KIAS
47
Max Autorotational Airspeed
100 KIAS
48
Turbulence Penetration Speed
80 KIAS
49
Altitude Limitations **(FCS OFF)**
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
Altitude Limitations **(FCS ON or IFR)**
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
Max Climb and Descent Rates in IFR
1000 fpm
52
Center of Gravity Limit **(FCS ON)**
From station 106.75 to 112.5
53
Center of Gravity Limit **(FCS OFF)**
From station 106.0 to 114.2
54
Center of Gravity Limit **(Front Doors Removed)**
From station 106.0 to 110.0
55
Prohibited Operations
* 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
Prohibited Maneuvers
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
Required Equipment for Night Flight
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 (14 decks)

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