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A B767-400 had an engineering authority/authorized worked on the leading edge slat track position sensors. Job card did not state what sensor position inboard or outboard.
| Attributes | |
| ACN | 651856 |
| Time | |
| Date | 200503 |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B767-400 and 400 ER |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : maintenance |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : inspector |
| Qualification | technician : powerplant technician : airframe technician : inspection authority |
| Experience | maintenance technician : 1.5 |
| ASRS Report | 651856 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper documentation maintenance problem : improper maintenance non adherence : far non adherence : published procedure |
| Independent Detector | aircraft equipment other aircraft equipment : slat asymmetry indication other flight crewa other flight crewb |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other other |
| Factors | |
| Maintenance | contributing factor : lighting contributing factor : work cards contributing factor : engineering procedure performance deficiency : non compliance with legal requirements performance deficiency : installation performance deficiency : inspection performance deficiency : logbook entry |
| Supplementary | |
| Problem Areas | Environmental Factor Weather Aircraft Chart Or Publication |
| Primary Problem | Chart Or Publication |
Narrative:
Engineering authority/authorized steps 5.3 and 6.3 (installation of leading edge slat track position sensor targets) were confusing as to what position was being worked. Work was being performed in adverse WX conditions without the convenience of a hangar or additional lighting. I verified all part numbers of targets; bolts; nuts; cotter pins and kit number before installation; but the above steps never stated what position of the installation was being worked (inbound or outbound). The aircraft returned to the departure airport on the second flight after accomplishment of the above noted engineering authority/authorized due to a slat asymmetry anomaly. Inspection revealed the inboard and outboard position targets were installed in the opposite location.
Original NASA ASRS Text
Title: A B767-400 HAD AN ENGINEERING AUTH WORKED ON THE LEADING EDGE SLAT TRACK POS SENSORS. JOB CARD DID NOT STATE WHAT SENSOR POS INBOARD OR OUTBOARD.
Narrative: ENGINEERING AUTH STEPS 5.3 AND 6.3 (INSTALLATION OF LEADING EDGE SLAT TRACK POS SENSOR TARGETS) WERE CONFUSING AS TO WHAT POS WAS BEING WORKED. WORK WAS BEING PERFORMED IN ADVERSE WX CONDITIONS WITHOUT THE CONVENIENCE OF A HANGAR OR ADDITIONAL LIGHTING. I VERIFIED ALL PART NUMBERS OF TARGETS; BOLTS; NUTS; COTTER PINS AND KIT NUMBER BEFORE INSTALLATION; BUT THE ABOVE STEPS NEVER STATED WHAT POS OF THE INSTALLATION WAS BEING WORKED (INBOUND OR OUTBOUND). THE ACFT RETURNED TO THE DEP ARPT ON THE SECOND FLT AFTER ACCOMPLISHMENT OF THE ABOVE NOTED ENGINEERING AUTH DUE TO A SLAT ASYMMETRY ANOMALY. INSPECTION REVEALED THE INBOARD AND OUTBOARD POS TARGETS WERE INSTALLED IN THE OPPOSITE LOCATION.
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.