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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
Nr indicator gauge color (4-6)
Yellow: 50.0-60.0% Red: 90% Green: 90-107% Red: 107%
26
Turbine Outlet Temperature (During Start) | Temperature Range|Time Limit (4.3.5 / 4-7)
up to 810* | No Limit 810* - 927*| 10 seconds max 927* | Max
27
Turbine Outlet Temperature (During Transient) | Temperature Range|Time Limit (4.3.5 / 4-7)
Up to 738* | No limit 738* - 810* | 5 Min. 810* - 843* | 6 Sec. 843* Max
28
Minimum fuel reserve requirement for TH-57B/C (4.3 / 4-7)
10 Gallons
29
Nr Limits (Power-on) (4.4 / 4-7)
Minimum: 97% Maximum: 100%
30
Nr Limits (Power-off) (4.4 / 4-7)
Normal Operating range is 90 - 107%
31
Transmission Oil Pressure limits for continuous operations (4.5 / 4-7)
30 - 50 psi
32
Minimum Transmission Oil Pressure (4.5 / 4-7)
30 psi
33
Maximum Transmission Oil Pressure (4.5 / 4-7)
70 psi
34
Transmission Oil Pressure that dictate a MAF (4.5 / 4-7)
50 - 70 psi
35
Transmission Oil Temperature limits (4.5 / 4-7)
15* - 110*C
36
Max continuous torque (4.6 / 4-7)
85%
37
Military torque power limit (4.6 / 4-7)
100% for 5 minutes
38
Transient torque limit (4.6 / 4-7)
100 - 110% for 5 seconds
39
Allowable fuel boost pump pressure (4.7 / 4-8)
4 - 30 psi
40
Standby generator limits (C) (4.8 / 4-8)
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
Rotor brake limit(4.9 / 4-8)
Should be applied between 38 - 30% Nr during normal operations
42
Starter limits Note
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
Starter limitations (External power) (4.10 / 4-8)
``` 25 Seconds - ON 30 Seconds - OFF 25 Seconds - ON 30 Seconds - OFF 25 Seconds - ON 30 Minutes - OFF ```
44
Starter limitations (Battery) (4.10 / 4-8)
``` 40 Seconds - ON 60 Seconds - OFF 40 Seconds - ON 60 Seconds - OFF 40 Seconds - ON 30 Minutes - OFF ```
45
Vne FCS OFF (4.10 / 4-8)
130 KIAS
46
Vne FCS ON (4.10 / 4-8)
122 KIAS
47
Sideward/rearward flight (4.11 / 4-8)
``` 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
Max Rate of Climb (4.11 / 4-9)
50 KIAS
49
Min IFR Speed (4.11 / 4-9)
65 KIAS
50
Max airspeed with any combination of doors off (4.11 / 4-9)
110 KIAS
51
Max autorotional speed (4.11 / 4-9)
100 KIAS
52
Turbulence penetration airspeed (4.11 / 4-9)
80 KIAS
53
Max Operating altitude: FCS OFF: 3,000 lbs gross wight and below (4.12 / 4-9)
20,000 foot pressure altitude | 18,000 foot DA
54
Maximum operating altitude: | FCS OFF: Above 3,000-pound gross weight (4.12 / 4-9)
16,000 ft pressure altitude | 13,000 ft density altitude
55
Maximum operating altitude: | IFR or FCS ON: 3,000-pound gross weight and below (4.12 / 4-9)
11,500-foot pressure altitude | 13,500-foot density altitude
56
Maximum operating altitude: | IFR or FCS ON: Above 3,000-pound gross weight (4.12 / 4-9)
8,500-foot pressure altitude | 11,000-foot density altitude
57
Climb/Descent Limits in IMC (4.13 / 4-9)
1,000 ft/min
58
Acceleration limits (G's) (4.14 / 4-9)
Upper: +2.5 g's Lower: +0.5 g's at max gross weight
59
Max gross weight internally (4.15 / 4-9)
3,200 lbs
60
Max gross weight including external cargo (4.15 / 4-9)
3,350 lbs

TH-57 2020 (2 decks)

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