From the pleminary report on the Lion crash found here :
https://www.flightradar24.com/blog/w...ary-Report.pdf
Perhaps others can draw conclusions from it. Note there should be a vertical line between Defect Description and Resolution Description
1.6.3
Aircraft Flight and Maintenance Log
The Aircraft Flight Maintenance Log (AFML) recorded that since 26 October 2018 until the occurrence date several problems occurred related to airspeed and altitude flag appeared on Captain (left) Primary Flight Display (PFD) three times, SPEED TRIM FAIL light illumination and MACH TRIM FAIL light illumination two times and IAS (Indicated Airspeed) and ALT (Altitude) Disagree shown on the flight Denpasar to Jakarta the day before the accident flight.
The summary of the aircraft defect recorded on AFML were as follows: No
Reported Date
Route
Defect Description
Resolution Description
1
26 October 2018
Tianjin Binhai to Manado
Speed and Altitude Flag show on Captain Primary Flight Display (no speed and altitude indication)
Performed check Onboard Maintenance Function (OMF), found maintenance message 27- 31000. Refer to Interactive Fault Isolation Manual (IFIM) 27- 31000, performed Stall Management and Yaw Damper (SMYD) number 1 system test carried out, result normal.
Maintenance light illuminate after landing
Performed check OMF, found message 27-31-000.
Performed erase maintenance message check out maintenance light goes off.
2
27 October 2018
Denpasar to Manado
Speed and Altitude Flag show on Captain Primary Flight Display (no speed and altitude indication)
Ref. IFIM task 27-32-00-810-816 REV October 2018.
Performed check OMF, found status message “Stall Warning System L”. Initial evaluation performed system test SMYD number 1, self-test result failed.
7 No
Reported Date
Route
Defect Description
Resolution Description
SPEED TRIM FAIL light illuminate and MACH TRIM FAIL light illuminate
Check correlated message found message Air Data (AD) invalid 27-31012, 34-61263, 3421107, 34-61263, 34-21123. BITE ADIRS L via CDU found message ADR Data invalid (34- 21007) and AOA SIGNAL FAIL (34-21023). Reset CBs ADIRU L DC and AC, and ADIRU L carried out, and performed system test SMYD number 1 result pass.
Reconnect and clean electrical plug of data module, check message on OMF status not active.
3
27 October 2018
Manado to Denpasar
Speed and Altitude Flag show on Captain Primary Flight Display (no speed and altitude indication)
Refer to IFIM task 27-32-00-810- 816 rev October 2018.
Perform check OMF status found message “STALL WARNING SYS L”. initial evaluation performed SMYD number 1 self- test result failed message 27-31- 12 (AD data invalid) and 27- 31015 (ADIRU data invalid).
Check OMF existing fault (34) found message 34-21107 (AIR DATA SIGNAL INVALID) and 34-21123 (AOA SIGNAL OUT OF RANGE).
BITE ADIRS L via CDU found message 34-21023 (AOA SIGNAL FAIL).
Reset CB ADIRU L AC and DC and ADIRU L carried out. System test pass. DFCS BITE result PASS. Erase status message carried out and check message not active.
SPEED TRIM FAIL light illuminate and MACH TRIM FAIL light illuminate
Auto-throttle Arm disconnect, during aircraft takeoff roll
For troubleshooting due to repetitive problem perform replaced angle of attack sensor in accordance with Aircraft Maintenance Manual (AMM) Task 34-21-05-000-001 and task 34-21-05-400-801 carried out.
Installation test and heater system test result good.
8 No
Reported Date
Route
Defect Description
Resolution Description
4
28 October 2018
Denpasar to Jakarta
IAS and ALT Disagree shown after take off
(Refer to IFIM task 34-20-00- 810-801 REV 15 June 2018).
Performed flushing Left Pitot Air Data Module (ADM) and static ADM. Operation test on ground found satisfied.
feel diff press light illuminate
Refer IFIM 27-31-00-810-803 Rev 15 June 2018, performed cleaned electrical connector plug of elevator feel computer carried out. test on ground found OK.