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Flashcards in Limits Deck (35):
1

Nf

Power on: 97-100%

Nf overspeed are determined on a sliding scale depending on TOT, Nf percentage, and duration.

Avoid range (steady state operation): 75-88% with torque above 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 avoided. Flight in this range shall be recorded on a MAF to ensure documentation and shall include duration.

Note- Transient operation when manipulating the twist grip from flight idle to full open is allowed and requires no MAF

2

Ng

Idle: 62+/-2 %

Normal: 59-105%

Maximum: 106 for 15 seconds

3

Engine oil pressure

Ng below 79%: Min 50 psi

Ng 79-94%: min 90 psi

Ng above 94: min 115 psi

Max: 130 psi except after cold weather start (150 psi)

4

Engine oil temperature

0-107*C

5

TOT Start

Up to 810*C: no limit

810-927*C: 10 sec limit

927*C: maximum

6

TOT Power Transient

Up to 738*C: no limit

738-810*C: 5 minutes

810-843*C: 6 sec

843*C: max

7

Fuel

10 gallons

8

Rotor Engagement/Disengagement Wind Limits

Forward: 40 KTS

Sideward: 25 KTS

Rearward: 17 KTS

9

Nr

Power on: 97-100%

Power off: 90-107%

10

Transmission oil pressure

Continuous: 30-50 psi

Min: 30 psi

Max: 70 psi

11

Transmission oil temperature

15-110*C

12

Torque

Max continuous: 85%

Military power: 85-100% for 5 min

Transient: 100-110% for 5 sec

13

Fuel pressure

4-30 psi

14

Standby generator

Prolonged operation while the primary power supply to the ESS No 1 bus prohibited at speeds below 65 KIAS

15

Rotor brake

Apply between 38-30% Nr

16

Starter Limits

External power- 25 sec on/ 30 sec off/ 25 sec on/ 30 sec off/ 25 sec on/ 30 min off

Battery- 40 sec on/ 60 sec off/ 40 sec on/ 60 sec off/ 40 sec on/ 30 min off

Note- if light off occurs within the first 20 seconds of start sequence, the starter may be operated for 60 seconds on with 60 second cooling off period. Three attempts can be made can be made in a 30 minute period the. Wait 30 minutes to allow starter to cool.

17

Airspeed- sideward and rearward flight

All airspeeds are calibrated airspeed except when indicated airspeed is stated

Density altitude (sideward/rearward):
0-1000': 25/ 15 KTS
1000-2000': 20/ 15 KTS
2000-4000: 15/ 15 KTS
4000-6000: 10/ 10 KTS
6000-1000: 5/ 5 KTS

18

Max ROC

50 KIAS

19

Min IFR speed

65 KIAS

20

Max speed with FCS off

3000 pound gross weight and below: 130 KIAS

DECREASE BY 3.5 KIAS per 1000' above 3000' DA

Above 3000 pound gross weight: 122 KIAS

DECREASE by 7 KIAS per 1000' above 3000' DA

21

Max speed IFR with FCS on

3000 pound gross weight and below: 122 KIAS

DECREASE BY 3.5 KIAS per 1000' above 3000' DA

Above 3000 pound gross weight: 122 KIAS

DECREASE by 7 KIAS per 1000' above 3000' DA

22

Max speed with any combination of doors off

110 KIAS

23

Max autorotational speed

100 KIAS

24

Turbulence penetration speed

80 KIAS

25

Max Operating Altitude

FCS off:

3000 pound gross weight and below- 20000 PA/ 18000 DA

Above 3000 pound gross weight- 16000 PA/ 13000 DA

IFR or FCS on:

3000 pound gross weight and below- 11500 PA/ 13500 DA

Above 3000 pound gross weight- 8500 PA/ 11000 DA



26

Climb/ Descent during IFR

1000 fpm

27

Acceleration

+2.5 to +.5 g's at max gross weight

28

Weight

3,200 pounds
3,350 pounds with external cargo

29

Longitudinal CG limits

FCS off: 106-114.2
FCS on: 106.75-112.5

Aft limits vary depending on gross weight for all operations

Lateral CG limits exist, however, for all allowable configurations fall within these limits

30

Minimum crew requirements

Min flight crew: one pilot and one observer

Min flight crew IFR: two pilots with one being a qualified instrument- rated pilot

Min flight crew for confined area landing or external cargo ops: one pilot, one observer, one aircrewman

Min crew weight: 180 pounds

31

Required equipment for IMC flight

Prohibited in TH57B

-Cyclic force trim system
-MINISTAB FCS
-Main generator
-Standby generator
-Battery protection circuit
-Instantaneous VSI
-Two attitude indicators with one automatically powered by approved standby battery source in event of power loss
-One operable communication system
-One operable navigation system appropriate to routes to be flown
-Radar altimeter
-Other equipment as required by the operating rules

32

Prohibited Operations

TH57B: operating IFR and in icing conditions

TH57C: in icing conditions

IFR prohibited with any doors removed or with external load

33

Prohibited maneuvers

-Aerobatic maneuvers
-Protracted operations in the AVOID or CAUTION areas of the height-velocity diagram
-Fully developed vortex ring state
-Intention entry into blade stall
-Hovering turns exceeding a rate of 45* per second

34

Required equipment for night flight

-All instrument and circuit breaker panel lights
-All exterior lights
-Operable communication radio
-Attitude gyro
-Radar altimeter

35

Required equipment for over water and shipboard operations

-Radar altimeter
-VSI