(b)
If an engine internal fire exists on shutdown, the starter may be re-engaged at 15% N2 and the engine motored until fire is out.
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CAUTION: RE-ENGAGING THE STARTER WHILE THE ENGINE IS ROTATING IS PERMISSIBLE FOR THIS EMERGENCY ONLY. SUCH RE-ENGAGEMENT CAN SHEAR THE STARTER SHAFT, DAMAGE THE STARTER, OR SHORTEN THE SERVICE LIFE OF THE ENGINE ACCESSORY DRIVE GEAR TRAIN. FOLLOWING SUCH RE-ENGAGEMENT, AND BEFORE USING STARTER AGAIN, INSPECT THE STARTER FOR SHEARED SHAFT OR OTHER DAMAGE.
CAUTION: DO NOT USE FIRE EXTINGUISHING AGENTS ON INTERNAL ENGINE OR TAILPIPE FIRE UNLESS MOTORING FAILS TO BRING FIRE UNDER CONTROL. HOT SECTION OF ENGINE CAN WITHSTAND VERY HIGH TEMPERATURE. NORMALLY, IF AN INTERNAL OR TAILPIPE FIRE IS PERMITTED TO BURN UNTIL ENGINE CAN BE MOTORED, ENGINE WILL EXPERIENCE FAR LESS DAMAGE THAN THAT WHICH WOULD BE CAUSED BY SPRAYING A CORROSIVE OR CHILLING AGENT INTO EXHAUST DUCT.
CAUTION: IF EXTERNAL FIRE EXTINGUISHING AGENTS HAVE BEEN DISCHARGED INTO POWER PLANT, POWER PLANT MUST BE INSPECTED AND CLEANED (REF. P&WA MAINTENANCE MANUAL 72-00).
(c) After fire is cleared, complete shutdown.
(3) Emergency engine shutdown (Engine Fire Warning)
(a)
Fully retard engine thrust lever and move start lever to CUTOFF in rapid succession.
CAUTION: DO NOT PLACE ENGINE START LEVER IN CUTOFF POSITION WITH ENGINE OPERATING IN THE HIGH RPM RANGE WITHOUT FIRST RETURNING THRUST LEVER TO FULLY RETARDED POSITION. INTERNAL DAMAGE TO THE FUEL CONTROL AND TURBINE WHEEL SEIZURE MAY OCCUR.
(b)
Position fuel pump switches to OFF after the engine stops rotating.
(c)
If a fire warning occurs on shutdown, pull applicable fire switch on fire protection system module on aft electronic panel. If fire warning continues, and engine is cowled, actuate fire extinguisher agent by rotating fire switch handle.
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13. New Engine Post Run Procedure
A. Perform Post Run
(1)
Return all switches to normal engine off positions.
(2)
Check for static oil leakage through No. 6 bearing carbon seals for a 20-minute period immediately following engine shutdown. Oil leakage appearing as an oily wetness but not puddling during this 20-minute period is acceptable. Oil puddling which occurs before the expiration of 20 minutes is unacceptable and engine must be disassembled as necessary to determine cause and then repaired.
(3)
After initial engine run perform the following:
(a)
Visually check all fuel, oil, air and hydraulic connections for security and leakage.
(b)
Remove, clean if necessary, and install the fuel pump inlet filter, fuel control coarse and fine filters, and the fuel pressurizing and dump valve filter.
(c)
Remove, clean if necessary, and install the engine oil filter and CSD oil filter elements.
(4)
Service engine oil tank within 2 hours of engine shutdown (AMM 12-13-11/201).
14. Return Airplane to Normal Configuration
A. Position switches on forward overhead panel as follows:
(1)
APU Switch - OFF
(2)
Battery Switch - OFF
(3)
Ground Power Switch - OFF, if no longer required
(4)
Gravel Runway Switch - OFF
B. If no longer required, remove electrical and/or pneumatic power.
C. Install cowl panels.
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POWER PLANT - COLD OPERATING PROCEDURES
1. General
A. During cold weather operation, needless damage to the engine can be prevented by the use of a few simple precautions. Ice formation in the engine inlet is one of the principal hazards during cold weather engine operation. Blowing snow can be turned into ice by entering a cooling engine, melting, and refreezing. The resulting ice formation can plate out on the compressor rotor blades setting up a potential unbalance and may even lock the rotor blades to the compressor case. Engine inlet icing can also occur on an operating engine because of the large airflows and suction at the engine inlet. This is particularly hazardous when operating at TAKE-OFF power under static conditions on the ground. Suction action reduces air pressure with a subsequent reduction in air temperature. This, in addition to evaporative cooling, causes ice to form when water droplets impinge upon the inlet guide vanes and nose dome.
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