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TH-73A EP/LIMITS > Limits > Flashcards

Limits Flashcards

1
Q

Gas Generator Speed (N1)

A 
Minimum - 51%
Cautionary (Auto only) - 51-60%
Continuous Operation - 60-100.1%
Take off (5min) - 100.1-103.2%
Maximum take off (5 min) - 103.2%
Transient (30 Sec) - 103.8
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2
Q

Power Turbine Speed (N2)

A 
Minimum - 95%
Cautionary - 95-101%
Continuous - 101-103%
Maximum - 103%
Transient (10sec) - 108%
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3
Q

Inter-Turbine Temperature (ITT)

A

Normal Operations:

Maximum Continuous - 755 C
Take-Off (5 min) - 755-810 C
Maximum take off (5 min) - 810 C
Transient (5 Sec) - 860 C

Starting:

Maximum - 870 C
Transient ( 2 sec between 980 and 1090) - 1090 C
Note: A linear variation applies above 870C, ten seconds, and 1090, two seconds.
Note: transient range must not be used intentionally

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4
Q

Engine Torque (TRQ)

A

Max continuous - 100%
Take off (5min) - 100-108.5%
Max take off (5 min) - 108.5%
Transient (6 sec) - 115%

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5
Q

Rotor limitations (Nr)

A

Power on:

Minimum - 95%
Cautionary - 95-101%
Continuous operation - 101-103%
Maximum - 103%
Transient (10 sec) - 108%

Power Off:

Transient (10 sec) - 80%
Minimum - 90%
Continuous operation - 90-110%
Maximum - 110%

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6
Q

Fuel Sys

A

Cautionary - 0-7psi
Continuous - 7-25psi
Maximum - 25psi

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7
Q

Engine Oil Pressure

A 
Minimum - 40psi
Cautionary (W/ N1 < 72%) - 40-80psi
Continuous - 80-110psi
Maximum - 110psi
Note: During cold weather starting conditions the oil pressure can temporarily exceed 110psi; it reduces as oil temperature increases.
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8
Q

Engine Oil Temperature

A

Max OAT for starting - Fig 4-5
Continuous - 10-115C
Max - 115C
Transient (5 min w/N1 at 61%) - 127C

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9
Q

Main Transmission Oil Pressure

A

Minimum - 30psi
Continuous - 30-55psi
Cautionary - 55-70psi
Max - 70psi

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10
Q

Main Transmission Oil Temperature

A

Continuous - 0-115C

Maximum - 115C

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11
Q

Engine Starter Limitations

A 
Battery:
40 seconds on, 60 seconds off
40 seconds on, 60 seconds off
40 seconds on, 30 minutes off
External Power:
25 seconds on, 30 seconds off
25 seconds on, 30 seconds off
25 seconds on, 30 minutes off
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12
Q

Generator Load Limits

A

Continuous - 0-200A
Max - 200A
Transient (5 sec) - 300A

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13
Q

Aux Generator Load Limits

A

Continuous - 0-150A
Max - 150A
Transient (5 sec) - 150A

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14
Q

Hydraulic System Limitations

A

Minimum - 1200psi
Cautionary - 1200-1400psi
Continuous - 1400-1600psi
Maximum - 1600psi

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15
Q

Vne (Power on/off)

A

152 KIAS (see chart)

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16
Q

Vne (IFR)

A

Lesser of 145 or Vne (Power on)

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17
Q

Vmini (IFR)

A

60 KIAS

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18
Q

Vmini (IFR Approach)

A

60 KIAS

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19
Q

Vmax (IFR Approach)

A

130 KIAS

20
Q

Minimum airspeed in auto (without close external reference)

A

60 KIAS

21
Q

Vne with doors open/removed

A

85 KIAS

22
Q

Vne searchlight extension, orientation, and retraction

A

120 KIAS

23
Q

Vne Doors opening / closing

A

70 KIAS

24
Q

Vne Searchlight extended

A

No change to basic NFM

25
Q

Vne with external loads attached to cargo hook (sea level to 5000’)

A

100 KIAS, above 5000’ decrease 3kts every 1000’ from 100 KIAS

26
Q

Max forward speed at touchdown after engine failure

A

50kts

27
Q

Max operating altitude

A

15,000’Hp

28
Q

Min ambient air temp

A

-13F (-25C)

29
Q

Max sea level ambient air temp

A

122F (50C)

30
Q

Slope

A

Nose up - 12 deg
Side up - 10 deg
Nose down - 2 deg
Nose down (unobstructed tail) - 5 deg

31
Q

Weight limits

A

Max gross weight for ground ops - 6393lb
Max gross weight - 6283lb
Min gross weight for flight - 3803lb
Max gross weight w/ext load - 6944lb

32
Q

One Helipilot inoperative

A

MUH: Attentive Above 500’AGL, Manual below 500’AGL
Max airspeed - 130 KIAS
Max rate of climb - 1000fpm

33
Q

Max airspeed with flight director engaged, or coupled, with any helipilot inop

A

100 KIAS

34
Q

Engine control

A

MEC only used in an emergency when EEG fails or for training purposes

35
Q

Baggage compartment

A

Max load - 330lb

Max unit load - 102 lb/ sq ft

36
Q

Bleed air heater

A

Should be OFF during takeoff and landing or when flight requires max power available.

37
Q

Rotor Brake

A

Limited to ground operations and shall be applied after engine shutdown and rotor RPM below 40%
Engine starting with the rotor brake on is prohibited

38
Q

Max hoist load

A

450 lb

39
Q

Prohibited operations

A
  1. TH-73A is prohibited from operating in Icing conditions

2. IFR operations are prohibited with any doors open/removed or with an eternal load.

40
Q

Prohibited Maneuvers

A
  1. Aerobatic Maneuvers
  2. Protracted operations in the AVOID areas of the height velocity diagram
  3. Intentional entry into retreating blade stall
41
Q

Min equipment for IFR

A
  1. AFCS (SAS1, SAS2 and attitude hold operational and on)
  2. Electrical (Main Gen, Aux Gen, Battery)
  3. Hyd (1 and 2 both operational and on)
42
Q

Cargo hook loading

A

From 1000-9000’ - 3086lb

above 9000 - decrease 110b every 1000’

43
Q

Minimum Crew

A

One pilot who shall operate the helicopter from the right crew seat
Left crew seat may be used for an additional pilot when approved dual controls are installed.

44
Q

Min IFR Crew

A

Two pilots with at least one being instrument rated

45
Q

Min CAL Crew

A

one pilot, a qualified observer and an aircrewman or two NATOPS qualified pilots.

46
Q

External Hoist

A

One pilot and one hoist operator (max weight of hoist operator is 198lb)

47
Q

Cargo Hook

A

When operating the cargo on the hook, only the personnel involved in the mission are allowed on board

TH-73A EP/LIMITS (2 decks)

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