CSP–520N–1
MD 520N (500N) ROTORCRAFT FLIGHT MANUAL
R
Revision 2
7–21/(7–22 blank)
FAA Approved
Procedures:
F
Ensure engine anti−ice, cabin heat, and scav air (if installed) are off prior
to engine wash or rinse.
F
Water injection will be started three seconds prior to starter
engagement.
F
Motor the engine with the twistgrip in CUTOFF.
F
Release starter switch as necessary to maintain between 5% and 10% N
1
speed during the wash/rinse.
F
Water injection will continue during coast down until N
1
stops.
F
Allow engine to drain.
F
Within 15 minutes of the water rinse, operate the engine at idle for five
minutes and actuate anti−ice, cabin heat, and scav−air (if installed) sys(
tems for one
minute
to purge and evaporate all residual water .
