 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
Flight crew of an medium large transport cpr jet forgot to slave directional gyroscopes to the magnetic compass prior to takeoff resulting in failing to turn to assigned heading after takeoff.
| Attributes | |
| ACN | 294246 |
| Time | |
| Date | 199501 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : fty |
| State Reference | GA |
| Altitude | agl bound lower : 600 agl bound upper : 3100 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dawn |
| Aircraft 1 | |
| Controlling Facilities | tracon : atl tower : bos |
| Operator | general aviation : corporate |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 91 |
| Navigation In Use | Other Other |
| Flight Phase | climbout : intermediate altitude ground : preflight |
| Route In Use | departure other enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 6400 flight time type : 5000 |
| ASRS Report | 294246 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : less severe non adherence : clearance other anomaly other other spatial deviation |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | controller : issued new clearance flight crew : overcame equipment problem other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Departed fty on runway 8. Clearance was to turn left heading 360 degrees, maintain 3100 ft MSL. After turning to 360 degrees, ZTL questioned why we were not turning to a 360 degree heading. The captain said to me that my directional gyroscope had failed and to use his. (He was in the right seat.) atl departure still unhappy with our heading, gave us another heading, but this time we had 2 controllers asking why we were not obeying the vectors they had given us. Rather than argue with them, we went to the aircraft wet compass and were able to maintain proper heading. They then handed us off to the next sector who also kept us on a radar vector. At this time we began to troubleshoot problem and discovered that our directional gyroscopes had precessed while on the ground and were never slaved to the proper heading. We reset directional gyroscopes and made remainder of flight without incident to teb. The before start and the taxi checklists both refer to checking these items but were overlooked.
Original NASA ASRS Text
Title: FLC OF AN MLG CPR JET FORGOT TO SLAVE DIRECTIONAL GYROSCOPES TO THE MAGNETIC COMPASS PRIOR TO TKOF RESULTING IN FAILING TO TURN TO ASSIGNED HDG AFTER TKOF.
Narrative: DEPARTED FTY ON RWY 8. CLRNC WAS TO TURN L HDG 360 DEGS, MAINTAIN 3100 FT MSL. AFTER TURNING TO 360 DEGS, ZTL QUESTIONED WHY WE WERE NOT TURNING TO A 360 DEG HDG. THE CAPT SAID TO ME THAT MY DIRECTIONAL GYROSCOPE HAD FAILED AND TO USE HIS. (HE WAS IN THE R SEAT.) ATL DEP STILL UNHAPPY WITH OUR HDG, GAVE US ANOTHER HDG, BUT THIS TIME WE HAD 2 CTLRS ASKING WHY WE WERE NOT OBEYING THE VECTORS THEY HAD GIVEN US. RATHER THAN ARGUE WITH THEM, WE WENT TO THE ACFT WET COMPASS AND WERE ABLE TO MAINTAIN PROPER HDG. THEY THEN HANDED US OFF TO THE NEXT SECTOR WHO ALSO KEPT US ON A RADAR VECTOR. AT THIS TIME WE BEGAN TO TROUBLESHOOT PROB AND DISCOVERED THAT OUR DIRECTIONAL GYROSCOPES HAD PRECESSED WHILE ON THE GND AND WERE NEVER SLAVED TO THE PROPER HDG. WE RESET DIRECTIONAL GYROSCOPES AND MADE REMAINDER OF FLT WITHOUT INCIDENT TO TEB. THE BEFORE START AND THE TAXI CHKLISTS BOTH REFER TO CHKING THESE ITEMS BUT WERE OVERLOOKED.
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.