Limits Flashcards
NGB Oil Pressure
30 - 100 psi Normal operation (green)
30 psi Minimum (<30 red w/box)
0 to 100 psi Resolution 1 psi.
NGB Oil Temp
134 Maximum (>134 red w/box)
0 - 134 Normal operation (<134 green)
-32 to 149 Resolution 1°
Rotor Diameter
48 FT
Height (Top of Antenna)
17 FT 6 IN
Overall Length
58 FT 1 IN
Turning Radius
37 FT 6 IN
NG overspeed protection
108-112%
Anti Ice shall be activated…
when aircraft is flown in visible moisture and FAT is less than 5 Degrees Celsius.
Maximum Torque Rate Attenuator
MTRA
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.
Hot Start Prevention.
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.
Contingency Power
When the opposite engine input signal is 51% torque
or below, contingency power is automatically enabled.
Engine TGT Limiter Function
• 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.
Engine TGT Limiter Variance
The limiting function has an inherent ±4° C variance. The resistance in the cabling produces a ±8° C variance.
Dual Engine Contingency (701D)
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)
Engine Emergency Oil System
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.
NP Overspeed Protection System.
If the NP meets or exceeds 119.6 ±1%
Fuel Cells
- Forward fuel cell holds 156 gal
* Aft fuel cell holds 220 gal
FORWARD FUEL LOW activation
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.
AFT FUEL LOW activation
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.
NR Limits
110 Maximum 106-110 Transient 106 High rotor annunciation 95-105 Normal operation 0-94 Transient
Engine Oil Pressure Limits
120 Maximum
23-120 Normal operation
23 Minimum
Hydraulic Pressure Limits
> 3410 Transient for 5 seconds
3310-3400 Transient for 5 minutes
2750-3300 Normal operation
1260 Minimum
TGT Limits
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
NP Limits
121 Maximum
115 Engine overspeed annunciated
106-121 Transient for 12 seconds
0-105 Normal operation
NG Limits
- 1 Maximum
- 3-105.1 Transient for 12 seconds
- 1-102.2 Normal operation
- 0 Minimum and engine out warning annunciated
Torque Limits for NR <50%
30 Maximum
0-30 Normal operation
Torque Limits for NR <90%
70 Maximum
0-70 Normal operation
DE Torque Limits
115 Maximum
101-115 Transient for 6 seconds
0-100 Normal operation
SE Torque Limits
125 Maximum 123-125 Transient for 6 seconds 111-122 SE Contingency 2.5 minutes 110 SE Maximum continuous 0-110 Normal operation
Engine Starts At Ambient Temperatures
of 61° F (16° C) and Below.
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.
Engine Starts At Ambient Temperatures
Above 61° F (16° C)
Two consecutive start cycles may be made. A 30 minute rest period is then required before any additional starts.
APU Operating Limitations.
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.
Maximum time on Battery power.
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.
Extended APU Ground Operations
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.
