Engine Start
The start is accomplished in accordance with the Manual Engine Start procedure
Pulling the Start switch out (held out by a solenoid) opens
the start and engine bleed air valves. The Start light illuminates. At 25% N3 or maximum motoring, the Fuel Control switch is moved to RUN. The spar, fuel metering, and engine fuel valves open and the selected igniter energizes. One igniter is normally selected for ground start while two igniters are selected for inflight start. Starter cutout occurs at 50% N3 RPM. At starter cutout, the Start switch is released to the in position, the start and bleed air valves close, the Start light extinguishes, and ignition discontinues. The start must be monitored until the engine stabilizes at idle.
ENGINE STARTING
This procedure outlines the steps that are necessary to start the engine.
You must monitor engine data during the start to make sure that start limits are not exceeded. Monitor EGT, engine oil pressure, N1, N2 and N3 rotor speeds, and vibration during the start.
BEFORE START CHECKLIST ............................................................ ..COMPLETE
NOTE: Read Normal Manual Start general notes and starting precautions.
CALL “STARTING ENGINE” ...................................1, 2, 3, OR 4
ENGINE START SWITCH .......................................PULL
START VALVE LIGHT .............................................ILLUMINATES
CLOCK (OBSERVER) .............................................START
DUCT PRESSURE..................................................30 PSI MIN
N3 ............................................................ ...........ROTATING
FUEL FLOW ..........................................................ZE RO
OIL PRESSURE.................................................... ..RISING
OIL TEMPERATURE ...............................................CHECK
OIL QUANTITY ......................................................CHECK
VIBRATION ...........................................................I NDICATED
EPR ............................................................ ..........INDICATED
N1 ............................................................ ............ROTATING
EGT......................................................... .............<100DEG
N2 ............................................................ ...........>10%
N3 ............................................................ ...........>25%
FUEL CONTROL SWITCH ......................................RUN
FUEL FLOW (NORMALLY 0.3) ...............................CHECK
CLOCK....................................................... ..........START
EGT RISE WITHIN 30 SECONDS...........................CHECK
AFTER LIGHT OFF
N3 INCREASE (OBSERVER) ...CALL 35-40-45-50-55-60%
CAUTION: IF EGT IS RAPIDLY APPROACHING A VALUE TEN TIMES THE N3, THEN YOU MUST ABORT THE START.
AFTER ENGINE HAS STABILIZED AT IDLE
START SWITCH ....................................................IN
START VALVE LIGHT..............................................EXTINGUIS HED
NAI......................................................... ..............AS REQ’D
EICAS MESSAGES ................................................CHECK
NOTE: Ensure that there are no EICAS Messages that affect normal engine operation or operation of the Electrical or Hydraulic systems driven by the engine(s) running.
ENGINE PARAMETERS...........................................CHECK
CAUTION: OPERATE THE ENGINE AT IDLE SPEED FOR 5 MINUTES.
ENSURE THAT THE OIL TEMP IS ABOVE -10DEGC. BEFORE
ACCELERATION
CLOCKS ............................................................ ..RESET
REPEAT THE START PROCEDURE AS REQUIRED.
AFTER START CHECKLIST................................................... .......PERFORM
PROCEDURE COMPLETE