MH60R Limits (01 FEB 23) Flashcards
Engines are limited by
Ng
Np
TGT
Oil Px
Oil temperature
A start cycle is defined as
Starter initiation
Acceleration in Ng
Starter dropout/disengagement
A 60 second delay between start attempts is required any time a starter is aborted, except in emergencies
For crossbleed starts, the receiving engine SHALL be at or above XX% Nx prior to advancing PCL to IDLE
24% Ng
The start TGT limit is
851*C until idle speed is attained
Engine operation with gust lock…
Engaged is prohibited
Minimum planned fuel
On landing shall be no less than 600 pounds
Operation of the APU in flight shall be limited to _____ operations only.
Acceptable in flight us includes:
Essential
- emergency procedures
- single-engine training
- practice autorotations
- powering the ECS during extreme temperature operations.
Turbine Gas Temperature (TGT)
0-810 Continuous // Green
810-851 30 Mins // Yellow
851-878 10 Mins // Red
878-903 2.5 Mins // Red
903-949 12 Seconds //Red
949 MAX // Red
Power Turbine Speed (Np)
<96% Avoid // Red
96-105% Continuous // Green (yellow above 101%)
105-117% 20 Seconds // Yellow
117-120% 12 Seconds // Yellow
120% MAX // Red
Caution: during engagement, extended operations in the 20 to 40% and 60 to 75% ranges may cause engine damage
Main Rotor Speed (Nr)
<96% Avoid // Red
96-101% Continuous // Green
101-120% Precautionary // Yellow
120% MAX // Red
123% Max for FCF Only // Red
127% Overspeed Latch // Red
Dual-Engine Torque (TRQ)
< 80 KIAS
0-120% Continuous // Green
120-144% 10 Seconds // Yellow
144% MAX // Red
Dual-Engine Torque (TRQ)
> 80 KIAS
0-106% Continuous // Green
106-127% 10 Seconds // Yellow
127% MAX // Red
Note: Dual Engine Torque Limits apply when both engines are above 65% torque.
Single-Engine Torque
0-135% Continuous // Green
135-144% 10 Seconds // Red
144% MAX // Red
Gas Generator Speed (Ng)
0-102.2% Continuous // Green
> 102.2-106% 2.5 Mins // Yellow
> 106-107% 12 Seconds // Red
107% MAX // Red
Gas Generator Speed (Ng)
0-102.2% Continuous // Green
> 102.2-106% 2.5 Mins // Yellow
> 106-107% 12 Seconds // Red
107% MAX // Red
Transmission Temperature (XMSN T)
-50 - 105*C Continuous // Green
105-120*C Precautionary // Yellow
120*C MAX // Red
Transmission Pressure (XMSN P)
20 PSI Minimum // Red
20-30 PSI Idle and transient // Yellow
30-65 PSI (45-60 in level flight) Continuous // Green
65-130 PSI Precautionary // Yellow
130 PSI MAX // Red
Engine Oil Temperature (ENG OIL T)
-50 - 135C Continuous // Green
135-150C 30 Mins // Yellow
150*C MAX // Red
Engine Oil Pressure (ENG OIL P)
22 PSI MINIMUM // Red
22-26 PSI Precautionary // Yellow
26-100 PSI Continuous // Green
100-120 PSI Precautionary // Yellow
120 PSI MAX // Red
Engine Start
<16*C
60 Seconds
60 Seconds
60 Seconds
30 Minutes
16-52*C
60 Seconds
30 Minutes
Engine Motor (ignition off)
Any Temperature
2 Mins engaged
5 Mins disengaged
2 Mins engaged
30 Mins disengaged
times for motoring are cumulative within a 5-minute period
The Transmission is limited by
Nr
Torque
Oil px
Oil temp
Operation is governed by whichever limit is reached first
During any operating condition, no maintenance action is required if main transmission oil (px/temp) is in the precautionary range continuously for XX minutes or less.
Temperature
5 minutes or less
Prolonged hovering in hot weather, XXF (XXC) may cause main transmission oil temperature to rise into the precautionary range.
Operation in the precautionary range for less than XX minutes during any one flight under this condition is acceptable and ____ maintenance action is required.
86F (30C)
Less than 30 minutes
No maintenance action is required
