TB 1-2835-205-20-4
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c. The following restrictions apply to serviceable APUs with over 2100 starts (525 APU hours times
4 equals 2100 starts TSN or TSI) which do not have a service life extension authorized per paragraph 9.b.
Those aircraft will have the condition status code changed to a circled red //X//. The circled //X// entry shall
state: "Aircraft restricted to APU ground and flight operations IAW SOF CH--47--00--01". while the aircraft
is on a circled red //X// it may be reported as fully mission capable (FMC).
(1) Do not operate the APU in--flight unless an emergency condition exists. Acceptable emer-
gency conditions are found in Chapter 9 of TM 55--1520--240--10 and TM 1--1520--252--10.
(2) Only maintenance requiring APU operation should be performed with the APU running. Every
effort should be made to minimize APU starts.
(3) During operational use of the aircraft, no one other than essential personnel shall be on
board at any time the APU is in operation (except in case of emergencies). Avoid standing in the plane of
rotation of the APU, either on the ramp, or to either side of the aircraft at station 594 when the APU is in
operation. No one shall be permitted to move into or out of the aircraft by way of the ramp when the APU
is in operation. Any movement through the plane of rotation of the APU alongside of the aircraft shall be
accomplished as quickly as possible.
(4) No APU with greater than 2100 starts TSN or TSI shall be used in public displays.
(5) Utilize aviation ground power unit (AGPU) for starting and maintenance whenever possible.
(6) Do not operate the APU while inside a hangar.
(7) The person in the cockpit while the APU is started will monitor the APU until the "APU ON"
light is on. This person will activate the APU shutoff switch in the event a compressor burst occurs during
APU start.
4