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TH-57 2020 > Limits > Flashcards

Limits Flashcards

1
Q

Minimum Nf (4.3.1 / 4-1)

A

97%

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2
Q

Maximum continuous Nf (4.3.3 / 4-1)

A

100%

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3
Q

Avoid Range (Steady-State Operation) (4.3.3 / 4-1)

A

71-88% Nf with engine torque great than 33%

  • Steady state is defined as holding Nf within a 2% range
  • Holding Nf in this range for 60 cumulative seconds requires turbine replacement and shall be voided
  • Flight in this range shall be recorded on a MAF to ensure documentation and shall include duration
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4
Q

Idle Ng rpm (4.3.3 / 4-1)

A

62 +/- 2 %

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5
Q

Ng normal operating range (4.3.3 / 4-1)

A

60 - 105%

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6
Q

Ng maximum transient (4.3.2 / 4-1)

A

106% is allowed for 15 seconds

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7
Q

Minimum engine oil pressure (4.3.3 / 4-1)

A

50 psi with Ng below 79%
90 psi with Ng between 79-94%
115 psi with Ng above 94%

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8
Q

Maximum engine oil pressure (4.3.3 / 4-1)

A

130 psi, except for temporary conditions up to 150 psi maximum immediately following a cold-weather start

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9
Q

Engine oil temperature limits (4.3.4 / 4-1)

A

0* - 107*C

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10
Q

Maximum head wind (4-3)

A

Up to 40 Knots

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11
Q

Maximum cross wind (left or right) (4-3)

A

Up to 25 Knots

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12
Q

Maximum tail wind (4-3)

A

Up to 17 Knots

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13
Q

Engine oil temperature gauge colors (4-4)

A

Green: 0-107
Red: 107*

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14
Q

Engine oil pressure gauge colors (4-4)

A 
Red: 50 psi
Yellow: 50-90 psi
Green: 90-115 psi (Single-Wide Arc)
Green: 115-130 psi (Double-Wide Arc)
Red: 130 psi
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15
Q

Transmission oil pressure gauge colors (4-4)

A

Red: 30 psi
Green: 30-50 psi
Red: 70 psi

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16
Q

Transmission oil temperature gauge colors (4-4)

A

Green: 15-110C
Red: 110*C

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17
Q

Loadmeter gauge color (4-4)

A

Red: 70%

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18
Q

Fuel pressure gauge color (4-4)

A

Red: 4.0 psi

Green 4.0-30.0 psi

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19
Q

Airspeed gauge color (4-4)

A

Green: 0-130 knots
Red: 130 knots
Blue: 100 knots

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20
Q

Torque gauge color (4-5)

A

Green: 0-85.0%
Yellow: 85.0-100%
Red: 100%

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21
Q

TOT Gauge color (4-5)

A 
Green: 100*-738*
Yellow: 738*-810*
Red: 810*
Red circle: 843*C
Red triangle: 927*
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22
Q

Fuel quantity gauge colors (4-4)

A

Red: 1.03 Gallons/Empty

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23
Q

Ng gauge colors (4-6)

A

Green: 60.0 to 105.0%
Red: 105.0%

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24
Q

Nf indicator gauge color (4-6)

A

Red: 97%
Green: 97-100%
Red: 100%

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25
Q

Nr indicator gauge color (4-6)

A

Yellow: 50.0-60.0%
Red: 90%
Green: 90-107%
Red: 107%

26
Q

Turbine Outlet Temperature (During Start)

Temperature Range|Time Limit (4.3.5 / 4-7)

A

up to 810* | No Limit
810* - 927| 10 seconds max
927 | Max

27
Q

Turbine Outlet Temperature (During Transient)

Temperature Range|Time Limit (4.3.5 / 4-7)

A

Up to 738* | No limit
738* - 810* | 5 Min.
810* - 843* | 6 Sec.
843* Max

28
Q

Minimum fuel reserve requirement for TH-57B/C (4.3 / 4-7)

A

10 Gallons

29
Q

Nr Limits (Power-on) (4.4 / 4-7)

A

Minimum: 97%
Maximum: 100%

30
Q

Nr Limits (Power-off) (4.4 / 4-7)

A

Normal Operating range is 90 - 107%

31
Q

Transmission Oil Pressure limits for continuous operations (4.5 / 4-7)

A

30 - 50 psi

32
Q

Minimum Transmission Oil Pressure (4.5 / 4-7)

A

30 psi

33
Q

Maximum Transmission Oil Pressure (4.5 / 4-7)

A

70 psi

34
Q

Transmission Oil Pressure that dictate a MAF (4.5 / 4-7)

A

50 - 70 psi

35
Q

Transmission Oil Temperature limits (4.5 / 4-7)

A

15* - 110*C

36
Q

Max continuous torque (4.6 / 4-7)

A

85%

37
Q

Military torque power limit (4.6 / 4-7)

A

100% for 5 minutes

38
Q

Transient torque limit (4.6 / 4-7)

A

100 - 110% for 5 seconds

39
Q

Allowable fuel boost pump pressure (4.7 / 4-8)

A

4 - 30 psi

40
Q

Standby generator limits (C) (4.8 / 4-8)

A

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

41
Q

Rotor brake limit(4.9 / 4-8)

A

Should be applied between 38 - 30% Nr during normal operations

42
Q

Starter limits Note

A

If a light-off occurs within the first 20 seconds of the start sequence, the starter may be operated for 60 seconds within 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.

43
Q

Starter limitations (External power) (4.10 / 4-8)

A 
25 Seconds - ON
30 Seconds - OFF
25 Seconds - ON
30 Seconds - OFF
25 Seconds - ON
30 Minutes - OFF
44
Q

Starter limitations (Battery) (4.10 / 4-8)

A 
40 Seconds - ON
60 Seconds - OFF
40 Seconds - ON
60 Seconds - OFF
40 Seconds - ON
30 Minutes - OFF
45
Q

Vne FCS OFF (4.10 / 4-8)

A

130 KIAS

46
Q

Vne FCS ON (4.10 / 4-8)

A

122 KIAS

47
Q

Sideward/rearward flight (4.11 / 4-8)

A 
Density Altitude Feet/ Max Sideward/ Max Rearward
0-1,000 ft/ 25/ 15 
1,000-2,000 ft/ 20/ 15 
2,000-4,000 ft/ 15/ 15 
4,000-6,000 ft/ 10/ 10 
6,000-10,000 ft/ 5/ 5
48
Q

Max Rate of Climb (4.11 / 4-9)

A

50 KIAS

49
Q

Min IFR Speed (4.11 / 4-9)

A

65 KIAS

50
Q

Max airspeed with any combination of doors off (4.11 / 4-9)

A

110 KIAS

51
Q

Max autorotional speed (4.11 / 4-9)

A

100 KIAS

52
Q

Turbulence penetration airspeed (4.11 / 4-9)

A

80 KIAS

53
Q

Max Operating altitude: FCS OFF: 3,000 lbs gross wight and below (4.12 / 4-9)

A

20,000 foot pressure altitude

18,000 foot DA

54
Q

Maximum operating altitude:

FCS OFF: Above 3,000-pound gross weight (4.12 / 4-9)

A

16,000 ft pressure altitude

13,000 ft density altitude

55
Q

Maximum operating altitude:

IFR or FCS ON: 3,000-pound gross weight and below (4.12 / 4-9)

A

11,500-foot pressure altitude

13,500-foot density altitude

56
Q

Maximum operating altitude:

IFR or FCS ON: Above 3,000-pound gross weight (4.12 / 4-9)

A

8,500-foot pressure altitude

11,000-foot density altitude

57
Q

Climb/Descent Limits in IMC (4.13 / 4-9)

A

1,000 ft/min

58
Q

Acceleration limits (G’s) (4.14 / 4-9)

A

Upper: +2.5 g’s
Lower: +0.5 g’s
at max gross weight

59
Q

Max gross weight internally (4.15 / 4-9)

A

3,200 lbs

60
Q

Max gross weight including external cargo (4.15 / 4-9)

A

3,350 lbs

TH-57 2020 (2 decks)

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