CSP-520N-1
MD 520N (500N) ROTORCRAFT FLIGHT MANUAL
Normal Procedures
R
Revision 1
4-28
FAA Approved
4-16. YSAS CHECK
F
Turn YSAS switch
ON
and confirm that the trailing edge of the right vertical
stabilator is at its nominal position (approximately 2 inches inboard of the 5 degree
mark on the degree plate located on the upper surface of the horizontal stabilizer).
NOTE
:
This position will vary somewhat depending on how level the helicopter is in the
roll attitude, however it is not considered critical for this ground check. Also, when
the YSAS switch is turned
ON
, movement of the right stabilator may or may not
take place based upon a recent change in the helicopter’s roll attitude and/or the
length of time the YSAS gyro has had to power up.
F
Hold the trailing edge of the horizontal stabilizer so the fingers of your right hand
rest on both sides of the trailing edge of the right vertical stabilator. With your left
hand, shake the helicopter laterally using either the tail skid or the horizontal
stabilizer mounting bracket. Vertical stabilator movement should be detected if the
actuator is functioning.
NOTE
:
If the YSAS actuator does not appear to be functioning properly, then the aircraft
may be flown, however the YSAS switch should be
OFF
and YSAS circuit
breaker
IN
until the YSAS actuator is replaced. If there is any concern about the
YSAS system operation, the YSAS ground test procedure should be performed
per the instructions contained in the HMI.
F
BAT/EXT PWR and interior/exterior lighting switches
OFF
4-17. NORMAL ENGINE RESTART
Do not exceed 150
°
C residual TOT when ignition is attempted.
Reduce TOT by motoring engine with starter. Speeds in excess of 15 percent
N
1
may be experienced.
