Kazan Helicopters Mi-17-1V Flight Manual page 54

M,,·17·1B. Flight manual
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1 2 3 4 Alt, km
Fig.3.2 APU Air Bleed Line Pressure (Loads OFF) versus Ambient Temperature
(OAT) and Airfield Altitude above Sea Level
3. In case of unsuccessful start, crank the APU proceeding in
the following way:
Set the "START-CRANK-FALSE START" (3AnYCK-
npOKPYT -JlO>KHbIIII 3AnYCK) selector switch to
"CRANK" (npOKPYT).
Depress the "START" (3AnYCK) button and observe the
"AUTO CONT ON" (ABTOMAT. BKJlf04EHA), "OIL PRESS
NORMAL" (AAB. MACJlA HOPMA) annunciators to come
on.
4. At ambient temperatures of -40°C or below heat the APU
before start with hot air at a temperature of +80 to +90°C for
25 to 30 min.
5. It is allowed to perform three APU starts each followed with
intervals not less than 3 min. Thereafter the APU should be
shut down and cooled for not less than 15 min.
6. It is allowed to perform 10 starts of the APU in sequence us-
ing the aircraft storage batteries (if a ground power source is
not available) provided the limitation ofstep 5 (Cooling doWn
after three starts) is respected.
7. It is allowed to perform three successive air bleeds from the
APU for the purpose of starting the TB3-117BM engines.
The duration of each air bleed cycle should not exceed 45
seconds with intervals between the air bleed cycles not less
than 1 min. during which the APU runs at idle. The continu-
ous time of the APU operation in this condition should not
exceed 10 min. and thereafter the APU should be shut down
for 15 min. for the purpose of cooling.
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