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In all manual ground starts, the operator must carry out an Extended Dry Crank (EDC) procedure, consisting of motoring the engine prior to start, for a period of 30 seconds at the maximum motoring speed achievable. However, during all automatic starts, the FADEC will determine if the EDC procedure is required and carry it out automatically. In both manual and automatic starts, it is permissible to continue the starting operation immediately following the EDC procedure, without performing a spool down of the engine.
AUTO Start . Ground
During an automatic start the EEC will perform all checks for starting anomalies. If a fault is detected, (hot starts, hung starts, etc.) the EEC will abort the start. The crew can stop the start sequence anytime, by selecting the ENGINE RUN switch to OFF.
AUTO Start . Air
The EEC will determine if an “ATS ENVELOPE”(≤ 249 knots) or a “WINDMILL ENVELOPE” (≥ 250 knots) will be performed. The type of start will be displayed on EICAS.
The air start sequence is initiated, when the ENG RUN switch is selected to ON.
NOTE
The type of start, ATS or WINDMILL, is latched at the moment that the ENG RUN switch is selected to ON. The EEC will continue to attempt that type of start, regardless of subsequent changes in airspeed or configuration.
If ATS ENVELOPE (starter assisted air start) has been selected, the EEC will select the SAV open, activate the starter motor, if N2 is below starter re-engagement speed (up to 42 % N2).
If WINDMILL ENVELOPE has been selected, the EEC will not select the SAV open.
The EEC will activate ignition immediately and open the HPSOV if N2 ≥ 8%. At approximately 45% N2, IGN will deactivate.
GF1810_086
Rev 3, Apr 25, 2005 Flight Crew Operating Manual Volume 2
POWER PLANT
STARTING AND IGNITION (CONT'D) Engine Starting (Cont’d) AUTO Start . Air (Cont’d)
During an automatic start the EEC will perform all checks for starting anomalies. If a fault is detected, the EEC will abort the start. (EEC will not abort an airborne relight, for hot starts).
The crew can stop the start sequence anytime, by selecting the ENGINE RUN switch to OFF.
Manual Start . Ground
The manual ground start sequence is as follows:
.
Crew selects IGNITION switch ON.
.
Crew selects the START SELECT switch to CRANK for the appropriate engine.
NOTE
The engine data quoted in this example are approximate values.
GF1810_088 GF1810_087
Volume 2 Flight Crew Operating Manual Rev 2A, Apr 11, 2005
Engine Starting (Cont’d)
Manual Start . Ground (Cont’d)
. At 20% N2, crew selects the ENGINE RUN SWITCH to ON. Fuel flow and light off occur.
NOTE
The EEC does not protect the engine from overtemp or any start anomalies during a manual start.
GF1810_089
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