CSP
−
E
−
1
ROTORCRAFT FLIGHT MANUAL
Performance Data
MD 500E
(Model 369E)
Revision 14
5
−
28
FAA Approved
Example 2:
WANTED:
Check engine performance
DATA OBTAINED DURING HOVERING:
Torque = 42.0 psig
TOT = 650
°
C
PA = 8000 feet
OAT = 7.5
°
C
NOTE
:
Be sure to add 2.5
°
C to the observed OAT before continuing.
Specification TOT (from chart): 645
°
C
Compare the specification TOT of 645
°
C with the TOT observed during
flight (650
°
C for this example). The TOT that was observed is higher than
the specification TOT. However, note that the junction of the 10
°
C curve
with the 645
°
C TOT line lies below the 8000 foot (PA) bleed line (dashed
line). Thus it is an inappropriate region in to which to determine power.
The higher−than−spec TOT is probably due to the accelerating bleed valve
being partially opened rather than the engine having some power deteriora-
tion. IF POSSIBLE, START OVER AND CHECK THE ENGINE PER-
FORMANCE AT A HIGHER POWER SETTING (ie., powered flight).
