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A mechanic and inspector working a B737-300 reported their job card identified the cabin pressure switch instead of the cabin differential pressure indicator to connect static pressure source.
| Attributes | |
| ACN | 762598 |
| Time | |
| Date | 200711 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Qualification | technician : powerplant technician : airframe |
| Experience | maintenance technician : 18 |
| ASRS Report | 762598 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | maintenance : inspector |
| Qualification | technician : airframe technician : inspection authority technician : powerplant |
| ASRS Report | 762602 |
| Events | |
| Anomaly | aircraft equipment problem : less severe maintenance problem : improper documentation |
| Independent Detector | other other : 1 |
| Resolutory Action | other |
| Consequence | other |
| Factors | |
| Maintenance | contributing factor : work cards contributing factor : engineering procedure |
| Supplementary | |
| Problem Areas | Chart Or Publication |
| Primary Problem | Chart Or Publication |
Narrative:
Idented wrong component on work card X; pitot static line check; step #9. Idented cabin pressure switch instead of differential pressure indicator to remove cap and connect static pressure source line. Supplemental information from acn 762602: idented wrong component on work card X pitot static lk check; step #9; instead of differential pressure indicator. In the future; ensure all steps of maintenance manual are followed. Callback conversation with reporter acn #762602 revealed the following information: reporter stated the job card identified the incorrect part to connect the static pressure source line to. This job card has been revised. The static pressure source line was properly connected and the static leak check was accomplished without any further problems.
Original NASA ASRS Text
Title: A MECHANIC AND INSPECTOR WORKING A B737-300 REPORTED THEIR JOB CARD IDENTIFIED THE CABIN PRESSURE SWITCH INSTEAD OF THE CABIN DIFFERENTIAL PRESSURE INDICATOR TO CONNECT STATIC PRESSURE SOURCE.
Narrative: IDENTED WRONG COMPONENT ON WORK CARD X; PITOT STATIC LINE CHK; STEP #9. IDENTED CABIN PRESSURE SWITCH INSTEAD OF DIFFERENTIAL PRESSURE INDICATOR TO REMOVE CAP AND CONNECT STATIC PRESSURE SOURCE LINE. SUPPLEMENTAL INFO FROM ACN 762602: IDENTED WRONG COMPONENT ON WORK CARD X PITOT STATIC LK CHK; STEP #9; INSTEAD OF DIFFERENTIAL PRESSURE INDICATOR. IN THE FUTURE; ENSURE ALL STEPS OF MAINT MANUAL ARE FOLLOWED. CALLBACK CONVERSATION WITH RPTR ACN #762602 REVEALED THE FOLLOWING INFO: REPORTER STATED THE JOB CARD IDENTIFIED THE INCORRECT PART TO CONNECT THE STATIC PRESSURE SOURCE LINE TO. THIS JOB CARD HAS BEEN REVISED. THE STATIC PRESSURE SOURCE LINE WAS PROPERLY CONNECTED AND THE STATIC LEAK CHECK WAS ACCOMPLISHED WITHOUT ANY FURTHER PROBLEMS.
Data retrieved from NASA's ASRS site as of January 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.