Limits Flashcards by Erin Clare

Gas Generator Speed (N1)

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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Power Turbine Speed (N2)

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

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Inter-Turbine Temperature (ITT)

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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Engine Torque (TRQ)

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

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Rotor limitations (Nr)

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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Fuel Sys

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

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Engine Oil Pressure

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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Engine Oil Temperature

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

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Main Transmission Oil Pressure

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

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Main Transmission Oil Temperature

Continuous - 0-115C

Maximum - 115C

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Engine Starter Limitations

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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Generator Load Limits

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

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Aux Generator Load Limits

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

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Hydraulic System Limitations

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

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Vne (Power on/off)

152 KIAS (see chart)

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Vne (IFR)

Lesser of 145 or Vne (Power on)

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Vmini (IFR)

60 KIAS

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Vmini (IFR Approach)

60 KIAS

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Vmax (IFR Approach)

130 KIAS

Minimum airspeed in auto (without close external reference)

60 KIAS

Vne with doors open/removed

85 KIAS

Vne searchlight extension, orientation, and retraction

120 KIAS

Vne Doors opening / closing

70 KIAS

Vne Searchlight extended

No change to basic NFM

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

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

Max forward speed at touchdown after engine failure

50kts

Max operating altitude

15,000'Hp

Min ambient air temp

-13F (-25C)

Max sea level ambient air temp

122F (50C)

Slope

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

Weight limits

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

One Helipilot inoperative

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

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

100 KIAS

Engine control

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

Baggage compartment

Max load - 330lb | Max unit load - 102 lb/ sq ft

Bleed air heater

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

Rotor Brake

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

Max hoist load

450 lb

Prohibited operations

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.

Prohibited Maneuvers

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

Min equipment for IFR

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)

Cargo hook loading

From 1000-9000' - 3086lb | above 9000 - decrease 110b every 1000'

Minimum Crew

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.

Min IFR Crew

Two pilots with at least one being instrument rated

Min CAL Crew

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

External Hoist

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

Cargo Hook

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