Engine Start Switch............................................................................. Engaged
Note: The pilot must hold the start switch in the ON position until 40% N2 RPM. Then, release the start switch and close the guard. Observe that the pneumatic pressure increases and the start valve open light extinguishes.
Note: On some aircraft, the start switch has a ground start position and when engaged remains in the ground start position. On these aircraft, positively ensure that the start switch is positioned to OFF at 40% N2.
N2 RPM.................................................................................Rotation Checked
Oil Pressure.............................................................................................Rising
N1 RPM.................................................................................Rotation Checked
Fuel Lever..........................................................On at Max Motoring, 20% N2 RPM Desired, 15% Minimum
Note: Move fuel lever on when N2 tach indicates max motoring RPM (Max motoring RPM is defined as no N2 RPM change for 5 seconds) and N1 RPM indicates positive rotation, will improve the probability of a good start.
Note: Guard fuel lever until engine is stabilized at idle RPM & EGT.
Initial Fuel Flow.........................................................Approximately 800 PPH EGT ......................................................................................Rising (475 Max) Note: Monitor engine start time as described in BURNER CAN STRESS DETECTION, this section. Continue to monitor EGT until N2 is stabilized at or 50%. Start Switch (at 40% N2)............................................................ Release to Off Note: If the start valve light fails to go out, close respective Eng Pneu
X-feed, place the FUEL lever to OFF, and refer to Section 3.
Oil Pressure Low Light...............................................................................Out
Idle Stabilized - Observe the Following:
.
N1 .............................................................................................. 22-30%
.
N2 .............................................................................................. 50-61%
.
EGT......................................300°C to 480°C Max (420°C-Bleeds Off)
.
Fuel Flow........................................................................ 600-1100 PPH
.
Oil Pressure............................................................................40-55 PSI
Caution: If engine does not accelerate to idle RPM within 120 seconds after start lever on, terminate engine start and initiate maintenance investigation for “Slow to Start.”
Note: After starting the -219 engine, if N2 stabilizes below 50% or EGT continues to rise, either add power momentarily to 65% N2 (while monitoring EGT) and return to idle (this will close the 13th stage bleed valve) or adjust power as required to maintain N2 at or slightly above 50%.
Note: Engine must be stabilized at idle before moving the respective pack switch to AUTO.
External Power & Air, APU
Ensure removal of any external connections prior to taxi. If the APU has been used for air conditioning, APU bleed air must be turned off before takeoff. Use of APU in flight is restricted to electrical output only. If take-off is to be made in rain or with water or slush on the runway, the APU should remain on for takeoff with the LEFT and RIGHT APU BUS switches ON. Otherwise, the APU should be turned off.
Burner Can Stress Detection
JT8D-217/217A engines may experience burner can stress which could lead to combustion chamber separation or severe burn through. The following guideline is provided to help Flight Crews detect burner can distress.
. During engine start: time from start of EGT rise until the engine first reaches the normal N2 idle RPM range should not exceed 40 seconds. A starting time in excess of 40 seconds should not be considered normal and should be written up in the aircraft logbook.
This guideline is not an operational limit and is only intended to trigger maintenance action. The Captain shall use his/her discretion in deciding if a flight should continue if an engine does not perform within the above guideline.
Crossbleed Start
Refer to Powerplant Abnormal Procedures.
Starting Windmilling Engines
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
本文链接地址：MD-80 Flight Manual 麦道80飞行手册 1(141)
