P
WER A
URAN
E
HE
K
H
VER
* HEATER / E.C.S. OFF. * TEST ENGINE MODE SWITCH - FLIGHT.
* GENERATOR LOAD TO MINIMUM (< 28 A). * OTHER ENGINE MODE SWITCH - IDLE.
* SET NR TO 102%.
* INCREASE COLLECTIVE UNTIL LIGHT ON WHEELS OR HOVERING AT 3 FEET, DO NOT EXCEED 820∞C TOT OR 97.4% N1 OR 124% TORQUE.
* STABILIZE POWER ONE MINUTE, THEN RECORD OAT, PRESSURE ALTITUDE, ENGINE TORQUE, TOT AND N1.
* ENTER CHART AT INDICATED ENGINE TORQUE, MOVE DOWN TO INTERSECT PRESSURE ALTITUDE, PROCEED TO THE RIGHT TO INTERSECT OUTSIDE AIR TEMPERATURE,
THEN MOVE UP TO READ VALUES FOR MAXIMUM ALLOWABLE TOT AND GAS PRODUCER RPM (N1).
* IF INDICATED TOT OR GAS PRODUCER RPM (N1) EXCEEDS MAXIMUM ALLOWABLE, REPEAT CHECK, STABILIZING POWER FOUR MINUTES.
* REPEAT CHECK USING OTHER ENGINE.
* IF EITHER ENGINE EXCEEDS ALLOWABLE TOT OR GAS PRODUCER RPM (N1) AFTER STABILIZING FOUR MINUTES, PUBLISHED PERFORMANCE MAY NOT BE ACHIEVABLE. CAUSE SHOULD BE DETERMINATED AS SOON AS PRACTICAL.
PRESSURE
ALTITUDE -
FEET
8000
7000
5000
3000
2000
0 (S.L.)
-1000
6000
4000
1000
70 80 90 100 110 120
ENGINE TORQUE - PERCENT (INDICATED)
RPT 109-60-99/II Rev C
OAT - ∞
50
-20
40
30
20
10
0
-30
-10
8580 90 95 100
MAXIMUM ALLOWABLE GAS PRODUCER RPM (N1) - PERCENT
ABHD181A
-30
OAT - ∞
50
40
30
20
10
0
-10
-20
550 600 650 700 750 800 850
MAXIMUM ALLOWABLE TOT - ∞
R.A.I. Approved 4-3
Rev. 2
RFM A109E
Figure 4-1. Power assurance check - hover.
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