CH5_LIMITS Flashcards
NR
ROTOR LIMITS
110: Maximum (>110 RED)
105-110: Transient (YELLOW)
105: High Rotor Warning Annunciated
97-104: Normal (GREEN)
97: Low Rotor Warning Annunciated
0-96: Transient (RED)
ENGINE OIL PSI NOTE (-10,Ch5-3)
It is normal for oil pressure to be high during first start when oil is cold. Oil pressure should return to normal limits after 5 minutes of operation at idle. Do not accelerate above ground idle until oil pressure can be held at or below maximum limit throughout acceleration.
ENG1 or ENG2
OIL PRESSURE (PSI)
120: Maximum (>120 REDwBOX)
23-120: Normal (GREEN)
23: Minimum (<23 RED)
HYDRAULIC PRESSURE (PSI)
> 3410: Transient perm for 5sec (YELLOW) >=5sec (REDwBOX)
3310-3400: Transient perm for 5min (YELLOW) >= 5min (REDwBOX)
2700-3300: Normal
1260: Minimum (<1260 REDwBOX)
TGT LIMITER NOTE (-10,Ch5-4)
Each engine incorporates a TGT limiter control which limits engine operation according to the following indicated TGT value:
Dual Engine: 879c +-5
Single Engine: 903c +-5
TGT LIMITS
949: Maximum (>949 RED)
904-949: Transient 12sec (YELLOW)
880-903: Contingency 2.5min (YELLOW)
847-879: Max Rated Power 10min (YELLOW)
851: Max During Start
794-846: Intermediate Rated Power 30min
793: Maximum Continuous
0-793: Normal
NP SPLIT NOTE
It is not abnormal to observe a NP split between ENG1 and ENG2 during autorotational descent when the engines are fully decoupled from the transmission. An increase from 100% to 105% is possible.
MAX NP VERTICAL TAPE INDICATION
120%
NP LIMITS
119: Maximum (>119 REDwBOX)
114: Engine Overspeed Annunciated
104-119: Transient 12sec (YELLOWwBOX@114)
0-103: NORMAL (GREEN)
ENG1 or ENG2
NG LIMITS
106.0: Maximum (>106.0 RED)
105.1-106.0: Transient 12sec (YELLOW)
63.1-105.0: Normal (GREEN)
63.0: Minimum Engine Out Annunciated (<63.0 REDwBOX)
TORQUE % WHEN
NR < 50%
30: Maximum (>30 RED)
0-30: Normal (GREEN)
TORQUE % WHEN
NR < 90%
70: Maximum (>70 RED)
0-70: Normal (GREEN)
TORQUE %
DUAL ENGINE
115: Maximum (>115 RED)
101-115: Transient 6sec (YELLOW)
0-100: Normal (GREEN)
TORQUE %
SINGLE ENGINE
125: Maximum (>125 RED)
121-125: Transient 6sec (YELLOW)
111-120: SE Contingency 2.5min (YELLOW)
110: SE Maximum Continuous (GREEN)
0-110: Normal (GREEN)
APU OPERATING CAUTION
Avoid prolonged operation at 94%-96% NR with the APU running. The APU clutch will oscillate from engaged to disengaged. This creates high loads on the clutch and shall be avoided.
APU OPERATING LIMITS
APU operation is PROHIBITED during normal flight. After a fault or aborted start, wait 30sec after APU has stopped before attempting another start. After 2 consecutive start at-tempts, wait 20min before third start attempt. No more than 3 start attempts are permitted in one hour.
EXTENDED APU GROUND OPERATIONS
Extended APU Ground Operations. During prolonged ground operations greater than 30min, observe XMSN TEMP 1 and XMSN TEMP 2 on the SYS page. If the temperatures exceed 140c, the APU shall be shutdown and the transmission fluid allowed to cool for 30min prior to resuming APU ground operations; or transmission fluid may be cooled by operating an engine with rotor turning. There is no requirement to remove transmission side panels during extended APU ground operations. However, the transmission fluid will not get as hot under high ambient temperature conditions if the side panels are removed.