Ch 5 (Limitations) Flashcards
Rotor Speed (NR)
LIMIT -- NR (%) Digital Readout 110 Maximum (>110 red) 106--110 Transient operation (yellow) 106 High rotor warning annunciated 95--105 Normal operation (green) 0--94 Transient operation (red)
ENGINE 1 OR 2 OIL PRESSURE (PSI)
LIMITS – ENGINE1 OR 2 OIL PRESSURE (PSI)
120 Maximum (>120 red w/box)
23–120 Normal operation (green)
23 Minimum
HYDRAULIC PRESSURE
LIMITS – HYDRAULIC PRESSURE
>3410 Transient operation permitted for 5 seconds (yellow). ( ≥ 5 seconds RED w/box)
3310 – 3400 Transient – operation permitted for 5 minutes (yellow) ( ≥ 5 minutes red w/box)
2750 – 3300 Normal operation (green)
1260 Minimum (<1260 red w/box)
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.
Dual Engine Starts
Dual engine starts are prohibited due to insufficient IPAS air.
701C TGT (°C)
949 Maximum (>949 red)
904–949 Single engine transient, 12 second limit (yellow)
879–903 Single engine contingency, 2.5 minute limit (yellow)
852–878 Intermediate rated power, 10 minute limit (yellow)
851 Maximum during start
811–851 Intermediate rated power, 30 minute limit (yellow)
810 Maximum continuous power
0–810 Normal operation (green)
701C TGT Limiter Control
NOTE
Each engine incorporates a steady state TGT limiter control which limits engine operation according to the following indicated TGT values:
Dual Engine: 866 +/– 12 (855–879)° C
Single Engine: 891 +/– 12 (884–908)° C
The limit value within these ranges can change over a period of time.
Engine Power Turbine Speed, (NP)
121 Maximum (>121 red w/box).
115 Engine overspeed annunciated.
106–121 Transient operation, 12 seconds (yellow, w/box at 115).
0–105 Normal operation (green).
Engine Gas Generator (NG) Limitations: 701C
105.1 Maximum (>105.1 red)
102.3–105.1 Transient 12 second limit (yellow)
63.1–102.2 Normal operation (green)
63 Minimum engine out warning annunciated (<63.0 red w/box).
TORQUE (%) WITH NR LESS THAN 50%
30 Maximum (>30 red) 0--30 Normal operation (green)
TORQUE (%) WITH NR LESS THAN 90%
70 Maximum (>70 red) 0--70 Normal operation (green)
TORQUE (%) DUAL ENGINE
115 Maximum ( >115 red)
101–115 Transient 6 second limit (yellow).
0–100 Normal operation (green).
TORQUE (%) SINGLE ENGINE
125 Maximum (>125 red)
123–125 Transient 6 second limit (yellow).
111–122 Single engine contingency, 2.5 minute limit (yellow).
110 Single engine maximum continuous power (green).
0–110 Normal operation (green).
APU Operating Limitations
APU operation is prohibited during normal flight. After a fault or aborted start, wait 30 seconds after compressor 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.
Extended APU Ground Operations
During prolonged ground operations greater than 30 minutes, observe XMSN TEMP 1 and XMSN TEMP 2 on the SYS page. If the temperatures exceed 130° C (266° F) the APU shall be shutdown and the transmission fluid allowed to cool for 30 minutes prior to resuming APU ground operations; or transmission fluid may be cooled by operating an engine with rotor turning.
APU NR Caution
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.