Limits Flashcards
1
Q
Minimum Nf RPM (Power-on)
A
97%
2
Q
Maximum continuous Nf RPM (Power-on)
A
100%
3
Q
Avoid Range Nf (Steady State Operation)
A
71-88% with engine torque greater than 33%
- Holding Nf in this range for a cumulative 60 seconds requires turbine replacement and should be avoided.
- Flight within this range shall be included on a MAF to ensure documentation and include duration
4
Q
Steady State definition (Nf)
A
Holding Nf within a 2% range
5
Q
Idle Ng RPM
A
62+/-2%
6
Q
Normal Operating Range Ng RPM
A
60-105%
7
Q
Maximum Transient Ng RPM
A
106% for 15 seconds
8
Q
Minimum Engine Oil Pressure
A
- 50 psi with Ng below 79%
- 90 psi with Ng between 79-94%
- 115 psi with Ng above 94%
9
Q
Maximum Engine Oil Pressure
A
130 psi, except for temporary conditions up to 150 psi immediately following a cold-weather start
10
Q
Engine Oil Temperature
A
0-107 degrees C
11
Q
Nf Overspeeds
A
Determined on a sliding scale depending on TOT, Nf percentage, and duration
12
Q
Engine Oil Temperature Gauge Colors
A
Green-0-107 degrees C
Red-107 degrees C
13
Q
Engine Oil Pressure Colors
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
14
Q
Transmission Oil Pressure Colors
A
Green-30-50 psi
Red-30, 70 psi
15
Q
Transmission Oil Temperature Colors
A
Green-15-110 degrees C
Red-110 degrees C
16
Q
Loadmeter Colors
A
Red-70%
17
Q
Fuel Pressure Colors
A
Red-4.0 psi
Green-4.0-30 psi
18
Q
Airspeed Colors
A
Green-0-130 knots
Red-130 knots
Blue-100 knots
19
Q
Fuel Quantity Colors
A
Red-1.03 gallons/empty
20
Q
Torque Colors
A
Green-0-85%
Yellow-85-100%
Red-100%
21
Q
Turbine Outlet Temperature Colors
A
Green-100-738 degrees C Yellow-738-810 degrees C Red-810 degrees C Red circle-843 degrees C Red triangle-927 degrees C
22
Q
Gas Producer Colors
A
Green-60-105%
Red-105%
23
Q
Dual Tachometer Power Turbine Indicator Colors
A
Red-97%
Green-97-100%
Red-100%
24
Q
Rotor Indicator Colors
A
Yellow-50-60%
Red-90%
Green-90-107%
Red-107%
25
Turbine Outlet Temperature (During Start)
Temperature Range: Time Limit:
- Up to 810 degrees C -No Limit
- 810-927 degrees C -10 seconds maximum
- 927 degrees C -Maximum
26
Turbine Outlet Temperature (During Power Transient)
Temperature Range: Time Limit:
- Up to 738 degrees C -No Limit
- 738-810 degrees C -5 minutes
- 810-843 degrees C -6 seconds
- 843 degrees C -Maximum
27
Minimum fuel reserve requirement (B/C)
10 gallons
28
Minimum Nr (Power-on)
97%
29
Maximum continuous Nr (Power-on)
100%
30
Normal operating range Nr (Power-off)
90-107%
31
Transmission Oil Pressure Limits (Continuous Operation)
30-50 psi
32
Minimum Transmission Oil Pressure Limits
30 psi
33
Maximum Transmission Oil Pressure Limits
70 psi
34
Transmission Oil Pressure Limits that dictate a MAF
50-70 psi
35
Transmission Oil Temperature Limits
15-110 degrees C
36
Maximum torque (Continuous Operation)
85%
37
Military power limit
100% for 5 minutes
38
Maximum transient torque
100-110 for 5 seconds
39
Allowable fuel boost pump pressure
4.0-30 psi
40
Standby generator speed limit
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
Should be applied between 38-30 % Nr during normal operations
42
Starter limitation 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 limits
```
External Power: Battery:
25 seconds-ON 40 seconds-ON
30 seconds-OFF 60 seconds-OFF
25 seconds-ON 40 seconds-ON
30 seconds-OFF 60 seconds-OFF
25 seconds-ON 40 seconds-ON
30 minutes-OFF 30 minutes-OFF
```
44
Airspeed limit Note
All airspeed values are calibrated airspeed except when the indicated airspeed is specifically stated.
45
Vne FCS OFF
130 KIAS
46
Vne FCS ON
122 KIAS
47
Sideward/rearward
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
Maximum rate of climb
50 KIAS
49
Minimum IFR speed (Vmini)
65 KIAS
50
Maximum airspeed with any combination of doors off
110 KIAS
51
Maximum autorotational airspeed
100 KIAS
52
Turbulence penetration airspeed
80 KIAS
53
Maximum operating altitude:
| FCS OFF: 3,000-pound gross weight and below
20,000 ft pressure altitude
| 18,000 ft density altitude
54
Maximum operating altitude:
| FCS OFF: Above 3,000-pound gross weight
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
11,500-foot pressure altitude
| 13,500-foot density altitude
56
Maximum operating altitude:
| IFR or FCS ON: Above 3,000-pound gross weight
8,500-foot pressure altitude
| 11,000-foot density altitude
57
Climb/Descent Rate of Climb Limit in IMC
1,000 ft/min
58
Acceleration Limit
Upper: +2.5 G's
Lower: +0.5 G's
@maximum gross weight
59
Maximum gross weight internal
3,200 lbs
60
Maximum gross weight external
3,350 lbs
61
Rotor Engagement/Disengagement Wind Limits
Front 45 to 45 - up to 40 kts max
45 to 45 both sides - up to 25 kts max
Back 45 to 45 - up to 17 kts max
62
Longitudinal Center-of-Gravity Limits
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.
63
Minimum Crew Requirements
1. The minimum flightcrew consists of one pilot and a qualified observer.
2. The minimum flightcrew 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.
64
Minimum Flight Crew Requirements
One pilot and a qualified observer
65
Minimum Flight Crew for IFR operations requirements
Two pilots, with at least one being an instrument-rated pilot
66
Minimum Flight Crew for Confined Area Landing and External Cargo operations requirements
One pilot, one qualified observer, and an aircrewman. No aircrewman required if both pilots are NATOPS qualified in model.
67
Minimum crew weight
180 lbs
68
Required Equipment for IMC Flight
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.
69
Prohibited operations
- 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.
70
Prohibited maneuvers
1. Aerobatic maneuvers.
2. Protracted operations in the AVOID and CAUTION areas of the height velocity diagram (Figure 4-6).
3. Fully developed vortex ring state.
4. Intentional entry into blade stall.
5. Hovering turns exceeding a rate of 45° per second.
71
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.
72
Required Equipment for Overwater and Shipboard Operations
1. Radar altimeter.
| 2. Vertical Speed Indicator.
