Limits

Question 1

NGB Oil Pressure

Answer 1

30 - 100 psi Normal operation (green)
30 psi Minimum (<30 red w/box)
0 to 100 psi Resolution 1 psi.

Question 2

NGB Oil Temp

Answer 2

134 Maximum (>134 red w/box)
0 - 134 Normal operation (<134 green)
-32 to 149 Resolution 1°

Question 3

Rotor Diameter

Answer 3

48 FT

Question 4

Height (Top of Antenna)

Answer 4

17 FT 6 IN

Question 5

Overall Length

Answer 5

58 FT 1 IN

Question 6

Turning Radius

Answer 6

37 FT 6 IN

Question 7

NG overspeed protection

Answer 7

108-112%

Question 8

Anti Ice shall be activated…

Answer 8

when aircraft is flown in visible moisture and FAT is less than 5 Degrees Celsius.

Question 9

Maximum Torque Rate Attenuator

MTRA

Answer 9

The MTRA is designed to reduce fuel
flow and limit rate of torque increase to approximately
12% per second when transient engine torque exceeds 100% during an uncompensated maneuver.

Question 10

Hot Start Prevention.

Answer 10

When Np and Ng are below their respective hot
start reference, and TGT exceeds 900° C, an output
from the HSP activates a solenoid in the ODV to shut
off fuel flow which causes the engine to shut down.

Question 11

Contingency Power

Answer 11

When the opposite engine input signal is 51% torque

or below, contingency power is automatically enabled.

Question 12

Engine TGT Limiter Function

Answer 12

• DE limiter setting is allowed a value of 866
±12 (854-878)° C.
• SE (contingency power) limiter setting is
allowed a value of 891 ±12 (879–903)°C.

Question 13

Engine TGT Limiter Variance

Answer 13

The limiting function has an inherent ±4° C variance. The resistance in the cabling produces a ±8° C variance.

Question 14

Dual Engine Contingency (701D)

Answer 14

Dual engine contingency is
activated when the TGT is within 11° C of the 866° C
limiter AND any of the following conditions occur:
• NP < 98% (drooping)
• NP rate decreasing (> 5%/sec)

Question 15

Engine Emergency Oil System

Answer 15

If oil pressure is lost, oil will bleed slowly out of reservoirs and be atomized by air jets thus providing an oil mist lubrication for the engine bearings for thirty seconds at 75% NG.
An ENGINE 1 or ENGINE 2 OIL PSI LOW caution is displayed when oil pressure drops below 20 - 25 psi.

Question 16

NP Overspeed Protection System.

Answer 16

If the NP meets or exceeds 119.6 ±1%

Question 17

Fuel Cells

Answer 17

• Forward fuel cell holds 156 gal

* Aft fuel cell holds 220 gal

Question 18

FORWARD FUEL LOW activation

Answer 18

caution is displayed when the forward cell quantity drops below 240 lb or when the low level switch in the fuel cell is activated.
The low level switch will be activated at 240 lb.

Question 19

AFT FUEL LOW activation

Answer 19

caution is displayed when the aft cell quantity drops below 260 lb or when the low level switch in the fuel cell is activated. The low level switch will be activated at a fuel quantity of 260 lb.

Question 20

NR Limits

Answer 20

110 Maximum 
106-110 Transient 
106 High rotor annunciation 
95-105 Normal operation
0-94 Transient

Question 21

Engine Oil Pressure Limits

Answer 21

120 Maximum
23-120 Normal operation
23 Minimum

Question 22

Hydraulic Pressure Limits

Answer 22

> 3410 Transient for 5 seconds
3310-3400 Transient for 5 minutes
2750-3300 Normal operation
1260 Minimum

Question 23

TGT Limits

Answer 23

949 Maximum 
904-949 SE Transient for 12 seconds 
879-903 SE Contingency for 2.5 minutes 
852-878 Maximum rated power for 10 minutes 
851 Maximum for starting 
811-851 Intermediate rated power for 30 minutes 
810 Maximum continuous 
0-810 Normal operation

Question 24

NP Limits

Answer 24

121 Maximum
115 Engine overspeed annunciated
106-121 Transient for 12 seconds
0-105 Normal operation

Question 25

NG Limits

Answer 25

105. 1 Maximum
106. 3-105.1 Transient for 12 seconds
107. 1-102.2 Normal operation
108. 0 Minimum and engine out warning annunciated

Question 26

Torque Limits for NR <50%

Answer 26

30 Maximum

0-30 Normal operation

Question 27

Torque Limits for NR <90%

Answer 27

70 Maximum

0-70 Normal operation

Question 28

DE Torque Limits

Answer 28

115 Maximum
101-115 Transient for 6 seconds
0-100 Normal operation

Question 29

SE Torque Limits

Answer 29

125 Maximum 
123-125 Transient for 6 seconds 
111-122 SE Contingency 2.5 minutes 
110 SE Maximum continuous 
0-110 Normal operation

Question 30

Engine Starts At Ambient Temperatures

of 61° F (16° C) and Below.

Answer 30

Two consecutive start cycles may be made, followed by a 3 minute rest period, followed by two additional consecutive start cycles. A 30 minute rest period is then required before any additional starts.

Question 31

Engine Starts At Ambient Temperatures

Above 61° F (16° C)

Answer 31

Two consecutive start cycles may be made. A 30 minute rest period is then required before any additional starts.

Question 32

APU Operating Limitations.

Answer 32

APU operation is prohibited during normal flight. After a fault or aborted start, wait 30 seconds after APU has stopped before attempting another start. After 2 consecutive start attempts, wait 20 minutes before third start attempt. No more than 3 start attempts are permitted in one hour.

Question 33

Maximum time on Battery power.

Answer 33

APU must be started within one minute of the initiation
of battery operations when FAT is > 43° C, within three minutes when FAT is between 32° C and 43° C, and within 20 minutes when FAT is < 32° C.

Question 34

Extended APU Ground Operations

Answer 34

Do not operate the APU for more than 5 minutes
at a XMSN TEMP1 or 2 of 120 - 130° C.
Shut down APU to prevent damaging accessory
gearbox components.

If the temperatures exceed 130° C, the APU shall be shutdown and the transmission fluid allowed to cool for 30 minutes; or transmission fluid may be cooled by operating an engine with rotor turning.