MD Helicopters MD900 with PW206E, Flight Manual

Page: 205 / 450

CSP–900RFM206E–1
Performance Data
ROTORCRAFT FLIGHT MANUAL
MD900 With PW 206E
FAA Approved
Original
5–53
EXAMPLE:
NOTE
: This example assumes the inability to access the third level POWER CHECK
menu and therefor uses Figure 5–45 to determine maximum N
G
value.
Recorded from the IIDS: OAT = +30
°
C
Pressure Altitude = 2000 ft.
Utilizing the Engine Torque Chart (Ref. Figure 5−43) the power setting for the above
noted conditions is determined to be:
Engine torque = 71%
Utilizing the EGT and N
G
Power Check Charts (Ref. Figure 5−44 and Figure 5−45)
the maximum values for EGT and N
G
for the above noted conditions is determined
to be:
EGT = 784
°
C
N
G
= 92.4%
After stabilizing the torque at 71% for one minute you record the following EGT
and N
G
readings from the IIDS:
EGT = 760
°
C
N
G
= 92%
Subtract the observed values of N
G
and EGT from the maximum values obtained
from the charts to determine the power check margins:
EGT = 784
°
C (from chart) minus 760
°
C (from IIDS) = 24
°
C (pass)
N
G
= 92.4% (from chart) minus 92% (from IIDS) = 0.4% (pass)