(3)
Air Intake Flap Does Not Fully Open (Class 1 Fault)
(a) If the ECB 59KD Build-In Test Equipment (BITE) completes the Power Up Test (PUT) and does not receive a 'FLAP OPEN'-signal within 30 seconds of transmitting the 'OPEN FLAP'-command, the following procedure occurs:
-the ECB interrupts the APU start procedure,
R EFF : 001-049, 101-105, 107-107, 151-199, 49-16-00Page 10 201-210, Config-2 Aug 01/05
CES
(b) After the MASTER SW has been set to the 'off'-position, the following sequence occurs:
-
the ECB transmits a 'FLAP CLOSE'-command to the air intake flap actuator,
-
the air intake flap actuator moves the flap into the 'CLOSED'-position within approximately 20s,
-when the air intake flap actuator reaches its end position 'extended' (flap in 'CLOSED'-position), a 'FLAP CLOSED'-signal is transmitted back to the ECB 59KD.
-the APU main relay 4KD is de-energized when the 30s have expired,
-electrical power is disconnected from the ECB.
C. Built-In Test Equipment (BITE) of the ECB 59KD
(1)
The BITE of the ECB automatically monitors the APU and the APU system control and isolates any component malfunctions. The ECB will shut down the APU when:
-
the air intake flap actuator does not supply a 'FLAP OPEN'-signal to the ECB. This will occur only when a signal has not been received for 0.5s and the APU speed is more than 7%,
-
the air intake flap does not open within 30s of driver start by the ECB 59KD,
(2)
When the APU is in operation and the BITE detects a malfunction, the following sequence occurs:
-
the ECB will shut the APU immediately down (no cool-down cycle),
-
the amber FAULT legend in the MASTER SW comes on and stays on,
-a caution
'APU AUTO SHUT DOWN
-MASTER SW ...................... OFF
is shown on the lower part of the ECAM upper display unit (Ref.
49-70-00).
(3)
When the MASTER SW is set to the 'off'-position, the following
sequence of operation occurs:
-
the amber FAULT legend in the MASTER SW goes off,
-
the ECB transmits a 'FLAP CLOSE'-command to the air intake flap actuator for 30 seconds,
-
the air intake flap actuator operates to close the air intake flap within 20s.
-when the air intake flap actuator reaches its end position 'extended' (flap in 'CLOSED'-position), a 'FLAP CLOSED'-signal is transmitted back to the ECB.
-the APU MAIN relay 4KD de-energizes when the 30s have expired,
-electrical power is disconnected from the ECB.
R EFF : 001-049, 101-105, 107-107, 151-199, 49-16-00Page 11 201-210, Config-2 Aug 01/05
CES D. Indications (Ref. 49-70-00)
(1)
If the air intake flap does not move to the fully open position within 30s, a Class 1 Fault will occur. APU AUTO SHUT DOWN occurs and the subsequent indications are given:
(a)
a continuous amber FAULT legend in the MASTER SW.
(b)
Glareshield panel 131VU (130VU) MASTER CAUT annunciator lights:
-steady amber MASTER CAUT annunciator lights,
-single chime.
(c)
On the ECAM upper display unit:
-an amber caution 'APU AUTO SHUT DOWN - MASTER SW OFF' shows on the lower part of the Engine/Warning page,
-INOP SYS - APU is shown on the ECAM status page,
-no APU AVAIL indication is given on the ECAM lower display unit.
(2)
When an APU EMERGENCY SHUT DOWN occurs on the ground (because an APU EMERGENCY STOP ground signal has been received by the ECB 59KD), indications are given on:
(a)
MASTER SW 14KD on panel 25VU:
-continuous amber FAULT legend in the switch.
(b)
Glareshield panel 131VU (130VU) MASTER CAUT annunciator lights:
-steady amber MASTER CAUT attention getters,
-single chime.
(c)
On the ECAM upper display unit:
-an amber caution, APU EMERG SHUTDOWN - MASTER SW OFF shows on lower part of warning page.
(3)
When the air intake flap does not fully close within 30s, a message indication is given on: ECAM Status Page (lower right corner):
-APU (indicates that a Class 2 Fault has occurred and is kept in the BITE Memory of the ECB 59KD).
E. ECB 59KD BITE Memory The BITE system of the ECB 59KD records all the system faults in the BITE memory. Access to these is through the Centralized Fault Display System (CFDS) (Ref. 49-73-00).
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