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A line mechanic inadvertently installs B737-800 type brake assemblies at the lh and rh main gear outboard wheel positions on a B737-700 aircraft.
| Attributes | |
| ACN | 795057 |
| Time | |
| Date | 200805 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Aircraft 1 | |
| Make Model Name | B737-700 |
| Operating Under FAR Part | Part 121 |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | other |
| Function | maintenance : technician |
| ASRS Report | 795057 |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper maintenance non adherence : far non adherence : published procedure |
| Independent Detector | other other : 1 |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other |
| Factors | |
| Maintenance | contributing factor : briefing performance deficiency : inspection performance deficiency : installation performance deficiency : non compliance with legal requirements performance deficiency : scheduled maintenance performance deficiency : training |
| Supplementary | |
| Problem Areas | Maintenance Human Performance |
| Primary Problem | Maintenance Human Performance |
Narrative:
I do realize I installed incorrect brake assemblies on aircraft X. I now understand that I should not have cleared force parts change screen. After being made aware of incorrect brake assembly change; I have reviewed B737-700/800/900 on brake installation per amm 32-41-41-460-801. I also reviewed gmm on technician's responsibility as well as ipc training and I also understand the responsibility of parts change. Callback conversation with reporter revealed the following information: reporter stated the B737-700 brake assembly has only 4-ROTORS and 4-STATORS as compared to the B737-800 which requires brakes with 5-ROTORS and 5 stators. They are all carbon fiber material. Reporter stated the -700 and -800's main landing gear axle brake mounting flange will accept either type of brake assembly. Main gear tire/wheel assemblies can also be mounted to the two different type of brakes.
Original NASA ASRS Text
Title: A LINE MECHANIC INADVERTENTLY INSTALLS B737-800 TYPE BRAKE ASSEMBLIES AT THE LH AND RH MAIN GEAR OUTBOARD WHEEL POSITIONS ON A B737-700 ACFT.
Narrative: I DO REALIZE I INSTALLED INCORRECT BRAKE ASSEMBLIES ON ACFT X. I NOW UNDERSTAND THAT I SHOULD NOT HAVE CLRED FORCE PARTS CHANGE SCREEN. AFTER BEING MADE AWARE OF INCORRECT BRAKE ASSEMBLY CHANGE; I HAVE REVIEWED B737-700/800/900 ON BRAKE INSTALLATION PER AMM 32-41-41-460-801. I ALSO REVIEWED GMM ON TECHNICIAN'S RESPONSIBILITY AS WELL AS IPC TRAINING AND I ALSO UNDERSTAND THE RESPONSIBILITY OF PARTS CHANGE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: REPORTER STATED THE B737-700 BRAKE ASSEMBLY HAS ONLY 4-ROTORS AND 4-STATORS AS COMPARED TO THE B737-800 WHICH REQUIRES BRAKES WITH 5-ROTORS AND 5 STATORS. THEY ARE ALL CARBON FIBER MATERIAL. REPORTER STATED THE -700 AND -800'S MAIN LANDING GEAR AXLE BRAKE MOUNTING FLANGE WILL ACCEPT EITHER TYPE OF BRAKE ASSEMBLY. MAIN GEAR TIRE/WHEEL ASSEMBLIES CAN ALSO BE MOUNTED TO THE TWO DIFFERENT TYPE OF BRAKES.
Data retrieved from NASA's ASRS site as of May 2009 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.