LIMITS Flashcards
If a limit is exceed to where “XXX” is indicated:
The crew shall land as soon as practicable.
Except for emergencies, a ___ delay is required between start attempts anytime a start is aborted.
60 second
For crossbleed starts the receiving engine shall be at or above ___ prior to advancing the PCL to idle.
24% Ng
TGT start limit
851 Celsius until idle speed is attained
Engine operation with ____ engaged is prohibited.
Gust lock
TGT Limit
EDECU MRP
0-810 continuous green 810-851 30 minutes yellow 851-878 10 minutes red (as required for max power and limiter checks only) 878-903 2.5 minutes red 903-949 12 seconds red 949 maximum
Np
<96% avoid red 96-105 continuous green (yellow >101) 105-117 20 seconds yellow 117-120 12 seconds yellow 120 maximum red
*during engagement extended operations in the 20-40 and 60-75 ranges may cause engine damage.
Nr
<96% avoid red 96-101 continuous green 101-120 precautionary yellow 120 max red >120 123% maximum for FCF only red 127 overspeed latch red
Dual engine torque <80kias
0-120 continuous green
120-144 10 seconds yellow
144 max red
Dual engine torque applies anytime both engines are above 65% torque
*Engine torques over 150 are displayed as red XXX.
Dual engine torque
>80 kias
0-106 continuous green
106-127 10 seconds yellow
127 max red
Dual engine torque applies anytime both engines are above 65% torque
*Engine torques over 150 are displayed as red XXX
Single engine torque
0-135 continuous green
135-144 10 seconds yellow
144 max red
*Engine torques over 150 are displayed as red XXX
Ng
0-102.2 continuous green
102.2-106 2.5 minutes yellow
106-107 12 seconds red
107 max red
XMSN Temp
-50-105 continuous green
105-120 precautionary yellow
120 max red
*prolonged hovering in hot weather 86F (30C) and high gross weight may cause temperatures to rise in the yellow precautionary range. Operation in the precautionary range for less than 30 mins during any one flight under these conditions is acceptable.
XSMN Pressure
20psi minimum red 20-30 idle and transient yellow 30-65 (45-60 in lvl flt)continuous green 65-130 precautionary yellow 130 max red
- during steady state level pitch attitudes (level flight) the xsmn oil pressure should be 45-60psi. The following conditions do not constitute an emergency situation but may be indicative of a degraded lubrication system. Any discrepancy shall be documented on a MAF.
1: steady pressure outside the 45-60 range but within the normal limits 30-65.
2: fluctuations not to exceed a range of 10psi within the normal limits of 30-65.
During transient pitch or steady state nose high attitudes (autos, downwind hovering, rearward flight, slope up landings) xsmn oil pressure fluctuations (including momentary fluctuations below 30psi and transient drops below 20psi for up to 1 second) are acceptable. Operating with pressure fluctuations below 30psi shall be limited to 30 minutes.
Engine Oil Temp
-50-135 normal green
135-150 30minutes yellow
150 max red
Eng oil press
22 min red 22-26 precautionary yellow 26-100 continuous green 100-120 precautionary yellow 120 max red
*normal idle is 22-55psi
Min fuel on landing
600 lbs
Engine Start/motor
START
STRTR ENGD STRTR DISNGD
<16c First cycle 60s
Second cycle. 60s
Third cycle. 60s
Fourth cycle. 30m
16-52c First cycle. 60s
Second cycle. 30m
ENGINE MOTOR (IGN OFF)
Any temp
Two minutes. 2min
Two minutes. 5min
- a start cycle is defined as starter initiation, acceleration and dropout.
- times for motoring are cumulative within a five minute period.
APU Limitations (not temps)
Not intended for routine flight use. Acceptable in flight use includes: Emergency procedures Single engine training Practice autos Powering ECS during extreme temp ops
