c.
On aircraft equipped with Extended Range Fuel Sys-tem, check ESSS and 230-gallon fuel tank for ice or snow. Remove as much as possible by hand and then use heated air. Start APU and turn on pressure to OUTBD fuel tanks. Wing-mounted pressure regulator may require heated air applied directly onto the exhaust vent protruding from the ESSS wing. After regulator valve is operating and fuel tanks are pressurized, leave system on. DO NOT TURN OFF PRESSURE SWITCHES OR PRESSURE REGULA-TORS MAY FREEZE.
d.
When parking the helicopter in temperatures below freezing, the gust lock may seize due to frozen moisture in rod assembly. Normal operations may be returned by warming the assembly. Main rotor tiedowns may be used in lieu of gust lock to meet parking requirements.
8.40.2 Cold Weather Control Exercise. After start-ing the APU, the controls must be exercised when operat-ing in a temperature range of -17°C (1°F) and below. The control exercise is required
a. At temperatures between -17°C (1°F) and -31°C(-24°F), cycle collective control slowly for 1 minute.
(1)
Move collective stick grip up about 3 inches from lower stop, and down again 30 times during 1 minute of control cycling in step a.
(2)
Move each tail rotor pedal alternately through 3/4-inch of travel from neutral po-sition 30 times during 1 minute of control cycling in step a.
b.
At temperatures between -31°C (-24°F) and -43°C (-45°F), cycle collective slowly for 2 minutes.
(1)
Move collective stick grip up about 1-1/2 inches from lower stop and down again during .rst minute, and 3 inches of travel during second minute of control cycling in step b.
(2)
Move each tail rotor pedal alternately through 3/8-inch of travel from neutral po-sition during .rst minute and 3/4-inch of travel during second minute of control cy-cling in step b.
c. At temperatures between -43°C (-45°F) and -54°C (-65°F), cycle collective stick grip slowly for 5 minutes.
Move collective and pedals through travel for times shown below:
Collective
Travel Pedals Travel Time
(Approximately) (Approximately) Duration
3/4-inch 1/8-inch First minute 1-1/2 inches 1/4-inch Second minute 1-3/4 inches 1/2-inch Third minute 2-1/2 inches 5/8-inch Fourth minute 3 inches 3/4-inch Fifth minute
8.40.3 Engine Operation.
a. Even though cold weather does not particularly affect the engine itself, it still causes the usual problems of ice in the fuel lines, control valves, and fuel sumps, which fre-quently prevent a successful cold weather start. It may be found that certain elements or accessories need preheating.
When starting an engine that has been ex-posed to low temperatures, watch for rise in TGT TEMP within 45 seconds. If no TGT TEMP rise is evident, manually prime the engine and attempt another en-gine start. If there is no overboard fuel .ow during prime, inspect for ice in the sumps and .lters. During cold weather operation, allow longer warm-up period to bring transmission oil temperature up to desired operating range refer to Chap-
ter 5. Monitor oil pressure and tempera-
ture closely. When advancing the power control levers, maintain transmission oil pressure in normal operating range.
b. When starting in cold weather below -40°C (-40°F), if light-off does not occur within 45 seconds after initial indication of Ng SPEED move ENG POWER CONT le-ver for the affected engine back to OFF, with the engine shutdown move the ENG POWER CONT lever from OFF to FLY, if the force required to move the ENG POWER CONT lever is higher than normal, suspect possible frozen PAS cable. This situation may require maintenance prior to attempting another start. If force is normal then attempt another start. If light-off still does not occur within 45 sec-onds, abort start and do the following:
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