DOC AIRBUS | AMM A320FIGNITION STARTING AND CONTINUOUS RELIGHT - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL
2. Description
Two modes are available for the starting of the engine:
The alternate start procedure is in the manual mode.
** ON A/C NOT FOR ALL Two modes are available for the starting of the engine:
- Automatic mode
- Manual mode.
The alternate start procedure is in the manual mode.
3. Operation/Control and Indicating
Normal Ground Autostart Sequence(1) In this mode, the Electronic Engine Control (EEC) provides automatic sequence of the starter, ignition and the fuel.
- The starter air valve opens at the initiation of the start, ignition sequences on at 15 percent N2 except when delayed by prefill functionality.
- Fuel sequences on at 20 percent N2.
- Ignition sequences off at 55 percent N2 and the starter air valve is commanded closed at a minimum of 60 percent N2.
(2) In the ground autostart mode, the EEC will automatically take corrective action for:
- Bowed rotor
- Hot start
- Sub-idle stall
- Failure to ignite
- Starter air valve stuck closed
- Low starter air pressure
- Starter shaft shear
- Starter duty exceedance
- Locked fan rotor
- Dual N2 sensor failure
- EGT sensing failure
- EGT exceedance.
(3) In the automatic mode, the adaptive start feature of the EEC varies the fuel schedule in an attempt to correct such conditions as hot start, sub-idle stall and failure to ignite, and core speed hang-up.
(4) If the engine has not successfully started after three total start attempts (corresponding to two automatic restart attempts), the EEC will abort the ground autostart.
(5) The automatic ground start procedure must include the items that follow:
(a) Oil quantity - Adequate considering oil level and expected oil consumption
(b) Electrical power - ON
(c) Thrust lever - Idle
(d) ENG START selector - NORM
(e) ENG MASTER switch - OFF
(f) MAN START push-button - OFF
(g) Fuel supply - Available
(h) Aircraft fuel boost pump - ON
(i) ENG START selector - IGN/STRT
(j) ENG MASTER switch - ON
(k) Start valve - Verify open
(l) Starter inlet air pressure - 25 psig (172 kPa)
(m) Start valve open - Verify
(n) N2 rotation - Verify
(o) Fuel flow - Monitor
(p) EGT - Monitor
(q) N1 and N2 - Monitor
(r) Oil pressure - Monitor
(s) Start valve - Verify closed at starter cutout speed
(t) ENG start selector - NORM (at idle).
(1) In the manual mode, the flight crew selects the sequence for starter, ignition, and fuel on within the certified start envelope. Starter and ignition off is controlled by the EEC in the same manner as in the autostart.
(2) With the exception of the bowed rotor logic, dual N2 sensor failure, starter shaft shear, start-stall, hot-start, and 750[C over temperature, the automatic abort, and adaptive start features are disabled in the manual mode.
The EEC monitors engine parameters and provides flight deck advisories for an abnormal start sequence but the flight crew must take the necessary corrective action to prevent exceeding limits.
Starter re-engage speed limits must be observed by the flight crew.
The EEC monitors engine parameters and provides flight deck advisories for an abnormal start sequence but the flight crew must take the necessary corrective action to prevent exceeding limits.
Starter re-engage speed limits must be observed by the flight crew.
(3) The manual ground start procedure must include the items that follow:
(a) Oil quantity - Adequate considering oil level and expected oil consumption
(b) Electrical power - ON
(c) Thrust lever - Idle
(d) ENG START selector - NORM
(e) ENG MASTER switch - OFF
(f) MAN START push-button - OFF
(g) Fuel supply - Available
(h) Aircraft fuel boost pump - ON
(i) ENG START selector - IGN/STRT
(j) MAN START push-button - ON
(k) Start valve - Verify open
(l) Starter inlet air pressure - 25 psig (172 kPa)(recommended, with start valve open)
(m) N2 rotation - Verify
(n) ENG master switch - ON at 20 percent N2
(o) Fuel flow - Monitor
(p) EGT - Monitor
(q) N1 and N2 - Monitor
(r) Oil pressure - Monitor
(s) MAN START push-button - OFF
(t) ENG start selector - NORM (at idle).
C. Ignition System - Continuous Operation
The ignition system is designed for continuous use. However normal engine operation does not require the use of continuous ignition. Ignition is automatically selected by the EEC for some flight conditions and can be inhibited for some engine operating conditions (high PS3).
In flight, the EEC will activate a continuous ignition when the ENG START selector is rotated to IGN/STRT position.
The ignition system is designed for continuous use. However normal engine operation does not require the use of continuous ignition. Ignition is automatically selected by the EEC for some flight conditions and can be inhibited for some engine operating conditions (high PS3).
In flight, the EEC will activate a continuous ignition when the ENG START selector is rotated to IGN/STRT position.