ROTOR MAXIMUM ALLOWABLE OPERATING SPEED: N1 - 106% (5486 RPM) N2 - 105% (15,183 RPM) AN ENGINE SHOULD NOT BE PERMITTED TO TAKE LONGER THAN 120 SECONDS TO ACCELERATE FROM START
LEVER ADVANCEMENT (FUEL ON) TO LOW IDLE.
DO NOT ALLOW STARTING EGT TO EXCEED 725`C. TERMINATE START ATTEMPT IF 725`C IS EXCEEDED, AND REFER TO AMM 72-00-00/601 FOR ENGINE OVERTEMPERATURE INSPECTION REQUIREMENTS.
OIL PRESSURE CAN VARY BETWEEN 13-35 PSI AT LOW IDLE AND 27-87 PSI AT TAKEOFF N1. ___
OIL __________________________ OIL PRESSURES BELOW 13 PSI ARE UNSAFE AND REQUIRE ENGINE
PRESSURE IS NOT ADJUSTABLE. SHUTDOWN. REFER TO FIG. 205.
SCAVENGE OIL TEMPERATURE LIMIT IS 160`C. TRANSIENT SCAVENGE OIL TEMPERATURES ABOVE 160`C ARE LIMITED TO 165`C MAXIMUM FOR UP TO 15 MINUTES. OPERATION ABOVE 165`C IS NOT PERMITTED.
LOW AND HIGH IDLE N2 RPM UNDER NO AIRBLEED OR GENERATOR LOADS AS SHOWN IN TRIM TABLES (REF AMM 71-00-01/201).
THE DURATION AND MAGNITUDE OF ALL ENGINE OVERTEMPERATURE CONDITIONS MUST BE RECORDED. IF
EGT LIMITS ARE EXCEEDED, REFER TO AMM 72-00-00/601 FOR ENGINE OVERTEMPERATURE INSPECTION REQUIREMENTS.
IF TAKEOFF POWER IS MAINTAINED FOR MORE THAN 5 MINUTES, RECORD TOTAL OPERATING TIME AT TAKEOFF POWER AND REFER TO APPROPRIATE INSPECTION REQUIREMENTS IN AMM 72-00-00/601, INSPECTION FOLLOWING ENGINE OPERATION BEYOND LIMITS.
Engine Starting and Operating Limitations
Figure 204
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CAUTION:
GROUND - OIL PRESSURES IN THIS AREA REQUIRE CORRECTION BEFORE FLIGHT. FLIGHT - OIL PRESSURES IN THIS AREA REQUIRE MONITORING OF TEMPERATURE AND PRESSURE. SHUT DOWN ENGINE IF OIL TEMPERATURE LIMIT IS EXCEEDED, OR OIL PRESSURE DROPS BELOW 13 PSI.
310 300
INDICATED OIL PRESSURE - PSI
100 90 80 70 60 50 40 30 20 10
0
50 60 70 80 90 100105110 N2 % RPM
G-M56-01-0027(1)-00-B
Oil Pressure versus N2% RPM
Figure 205
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PREFERRED WIND VELOCITY VARIATION IS 4 KNOTS OR LESS. _______ IF ENGINE RUNS ARE DONE OUT
CAUTION:
17 PREFERRED MAXIMUM WIND VELOCITY
OF THE PREFERRED LIMITS,
IN KNOTS. EXAMPLE: 17 KNOTS
MONITOR ENGINE PARAMETERS N1,
MAXIMUM VELOCITY AT 25` RELATIVE
N2 AND EGT. ENGINE OVERHEAT
TO AIRPLANE HEADING.
OR STALL CAN OCCUR AND CAUSE ENGINE DAMAGE.
Preferred Relative Wind Direction and Velocity Limitations
During Engine Part Power Trim Runs
Figure 206
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S 842-035-C00
(4)
Refer to the next paragraph subtask for additional wind limitations
and information for the effect of tailwinds on engine ground
operations.
S 842-036-C00
(5)
The definitions of thrust are found by positioning the thrust lever
to a specific N1% speed.
(a) TAKEOFF
1) This is the maximum thrust that can be used and not overboost the engine. a) This thrust can be used for a maximum of 5 minutes. b) This thrust is to be used only for takeoff.
2) If takeoff power is maintained for more than 5 minutes, do these steps: a) You must make a record of the total time the engine was
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