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A B737-300 was dispatched in non compliance with aircraft not downgraded from autoland to CAT ii after replacement of the inertial reference unit.
| Attributes | |
| ACN | 602535 |
| Time | |
| Date | 200312 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | ground : maintenance |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Qualification | technician : powerplant technician : airframe |
| ASRS Report | 602535 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | maintenance : lead technician |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper maintenance non adherence : published procedure |
| Independent Detector | aircraft equipment other aircraft equipment : autoland status placard other other : person 1 |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other |
| Factors | |
| Maintenance | contributing factor : schedule pressure contributing factor : briefing performance deficiency : installation performance deficiency : logbook entry performance deficiency : non compliance with legal requirements performance deficiency : testing |
| Supplementary | |
| Problem Areas | Maintenance Human Performance Aircraft Environmental Factor |
| Primary Problem | Maintenance Human Performance |
Narrative:
I was called to aircraft for a problem with the IRS fault light. I replaced the IRU (inertial reference unit) and realigned the system and it checked normal. However, I did not downgrade the CAT status of aircraft. I knew just after departure that I made the mistake and reported same to our technician services. This, along with the added pressure to make the departure and also having 3 gate calls and only 2 mechanics, only added to the problem. I did talk to my lead, avionics technician, pilot and others and the CAT status was never brought up. I will make sure not to assume anything again. We also called and spoke to technician center and asked them to let the mechanic know if a part called out for replacement will effect CAT as a reminder.
Original NASA ASRS Text
Title: A B737-300 WAS DISPATCHED IN NON COMPLIANCE WITH ACFT NOT DOWNGRADED FROM AUTOLAND TO CAT II AFTER REPLACEMENT OF THE INERTIAL REF UNIT.
Narrative: I WAS CALLED TO ACFT FOR A PROB WITH THE IRS FAULT LIGHT. I REPLACED THE IRU (INERTIAL REF UNIT) AND REALIGNED THE SYS AND IT CHKED NORMAL. HOWEVER, I DID NOT DOWNGRADE THE CAT STATUS OF ACFT. I KNEW JUST AFTER DEP THAT I MADE THE MISTAKE AND RPTED SAME TO OUR TECHNICIAN SVCS. THIS, ALONG WITH THE ADDED PRESSURE TO MAKE THE DEP AND ALSO HAVING 3 GATE CALLS AND ONLY 2 MECHS, ONLY ADDED TO THE PROB. I DID TALK TO MY LEAD, AVIONICS TECHNICIAN, PLT AND OTHERS AND THE CAT STATUS WAS NEVER BROUGHT UP. I WILL MAKE SURE NOT TO ASSUME ANYTHING AGAIN. WE ALSO CALLED AND SPOKE TO TECHNICIAN CTR AND ASKED THEM TO LET THE MECH KNOW IF A PART CALLED OUT FOR REPLACEMENT WILL EFFECT CAT AS A REMINDER.
Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.