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A B737-300 on elevator rig test flight at FL350 went to manual reversion and experienced an immediate hard full nose up pitch causing an altitude deviation.
| Attributes | |
| ACN | 547423 |
| Time | |
| Date | 200205 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | msl single value : 35000 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zab.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 210 flight time total : 20000 flight time type : 12000 |
| ASRS Report | 547423 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 250 flight time total : 17000 flight time type : 2400 |
| ASRS Report | 547425 |
| Events | |
| Anomaly | aircraft equipment problem : critical altitude deviation : excursion from assigned altitude |
| Independent Detector | aircraft equipment other aircraft equipment : altimeter other flight crewa other flight crewb |
| Resolutory Action | flight crew : returned to assigned altitude |
| Consequence | other other |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
Test flight for elevator rig. Procedure calls for switching off flight control and spoiler switches at FL350 creating a manual reversion. Upon turning off the switches, we experienced an immediate hard full nose-up pitch and altitude deviation. Recommend modification of maintenance procedure to initiate manual reversion at lower altitude and within a block of airspace with a printed warning of possible altitude deviation.
Original NASA ASRS Text
Title: A B737-300 ON ELEVATOR RIG TEST FLT AT FL350 WENT TO MANUAL REVERSION AND EXPERIENCED AN IMMEDIATE HARD FULL NOSE UP PITCH CAUSING AN ALTDEV.
Narrative: TEST FLT FOR ELEVATOR RIG. PROC CALLS FOR SWITCHING OFF FLT CTL AND SPOILER SWITCHES AT FL350 CREATING A MANUAL REVERSION. UPON TURNING OFF THE SWITCHES, WE EXPERIENCED AN IMMEDIATE HARD FULL NOSE-UP PITCH AND ALTDEV. RECOMMEND MODIFICATION OF MAINT PROC TO INITIATE MANUAL REVERSION AT LOWER ALT AND WITHIN A BLOCK OF AIRSPACE WITH A PRINTED WARNING OF POSSIBLE ALTDEV.
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.