Austro Engine AE330 User Manual

Maintenance Manual
E4.08.04
Issue date: 15-Nov-2011
Page: 92-10
Revision no: 10
Trouble Shooting Steps:
1. Display the FCM entry (fault details)
2. The “propeller self test internal state” provides the number of the phase which has
been aborted. Refer to the “Self Test Overview” to understand what the expected
result of the phase was.
3. Depending on the information provided by step 2, check:
4a. The “Propeller speed” to see if a speed goal had not been reached.
4b. The “Timeout error flags” to see the reason for a timeout
4c. The “Self test release status” to see if a release condition is not fulfilled anymore.
Layout of Timeout Error Flags:
Bit position
7
6
5
4
3
2
1
0
Timeout error flags shown in FCM:
0
0
0
0
0
x
x
x
Bits 0, 1 or 2 will be set to “1” to indicate the reason for the self test timeout:
Bit
Description of reason
0
“1” = Timeout during pitch-up test “state 3” (expect rpm drop > 70rpm within 8s)
1
“1” = Timeout during pitch-down test “state 4” (expect rpm > 1870 rpm within 3s)
2
“1” = Overall propeller self test timeout (expect overall test completion within 25s)
3-7
Not used
Layout of Self Test Release Status:
Bit position
7
6
5
4
3
2
1
0
Release status as shown in FCM:
x
x
x
x
x
x
x
x
The Propeller Self Test will start if bit 0 (release self test) has been set to “1”. Bits 2-7 will indicate the
individual release criteria as described in the “Self Test Overview”.
Bit
Description of release condition
0
“1” = Overall release to start self test is given
1
“1” = No active error pending
2
“1” = Bits 5 and 6 are set to “1”
3
“1” = The self test switch in the cockpit is actually pressed
4
“1” = Self test switch rising edge detected; “0” = self test switch falling edge detected
5
“1” = Power lever is in low idle position ( < 5%)
6
“1” = If propeller speed was idle ( < 1000rpm) AND squat switch (WoW) is depressed
7
“1” = Current propeller speed is idle ( <1000rpm)
Each ECU senses the power lever position separately. So if the power lever sensors are not
properly aligned one ECU might release the self test with power lever position <5% while
the other ECU might not release the self test because it senses a position >5% !
There is a hysteresis in the detection of propeller idle speed. If the propeller speed increases
beyond 1000rpm, it has to be decreased below 800rpm again before the release criteria of
bits 6 and 7 can be fulfilled again.

Austro Engine AE330 Specifications

General

Brand	Austro Engine
Model	AE330
Category	Engine
Language	English