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During initial climb after departing dtw, flight crew realized neither transponder was operative nor was either of the aircraft's DME. All fused to 1 fuse, failure.
| Attributes | |
| ACN | 174859 |
| Time | |
| Date | 199103 |
| Day | Sat |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : dtw |
| State Reference | MI |
| Altitude | msl bound lower : 5000 msl bound upper : 5000 |
| Environment | |
| Flight Conditions | Mixed |
| Aircraft 1 | |
| Controlling Facilities | tracon : dtw |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Transport, High Wing, 2 Turboprop Eng |
| Flight Phase | climbout : initial climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : cfi pilot : commercial pilot : instrument |
| Experience | flight time last 90 days : 270 flight time total : 5400 flight time type : 1600 |
| ASRS Report | 174859 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | aircraft equipment problem : less severe |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
I noticed my DME (captain's side) appeared to have failed. After contacting departure control, we were advised that we were not indicating a transponder beacon. We switched to transponder #2. During this process, we completed the after takeoff checklist. During this, we discovered that both DME's had failed. Additionally, ATC advised us that they still did not read our transponder. Further investigation showed that both xponders and encoders and both DME's had failed. Approval was received from ATC to operate in TCA west/O this equipment. After have maintenance look at the problem, we discovered that all these items are wired into 1 fuse labeled, 'radio #1.' our concern is that these items should be protected by separate circuits on this aircraft. Further investigation has shown that several other aircraft are wired in this manner. Loss of both these items, with such a vague label of the associated fuse, could pose future problems, especially in high density traffic areas in IFR flight.
Original NASA ASRS Text
Title: DURING INITIAL CLIMB AFTER DEPARTING DTW, FLT CREW REALIZED NEITHER TRANSPONDER WAS OPERATIVE NOR WAS EITHER OF THE ACFT'S DME. ALL FUSED TO 1 FUSE, FAILURE.
Narrative: I NOTICED MY DME (CAPT'S SIDE) APPEARED TO HAVE FAILED. AFTER CONTACTING DEP CTL, WE WERE ADVISED THAT WE WERE NOT INDICATING A XPONDER BEACON. WE SWITCHED TO XPONDER #2. DURING THIS PROCESS, WE COMPLETED THE AFTER TKOF CHKLIST. DURING THIS, WE DISCOVERED THAT BOTH DME'S HAD FAILED. ADDITIONALLY, ATC ADVISED US THAT THEY STILL DID NOT READ OUR XPONDER. FURTHER INVESTIGATION SHOWED THAT BOTH XPONDERS AND ENCODERS AND BOTH DME'S HAD FAILED. APPROVAL WAS RECEIVED FROM ATC TO OPERATE IN TCA W/O THIS EQUIP. AFTER HAVE MAINT LOOK AT THE PROB, WE DISCOVERED THAT ALL THESE ITEMS ARE WIRED INTO 1 FUSE LABELED, 'RADIO #1.' OUR CONCERN IS THAT THESE ITEMS SHOULD BE PROTECTED BY SEPARATE CIRCUITS ON THIS ACFT. FURTHER INVESTIGATION HAS SHOWN THAT SEVERAL OTHER ACFT ARE WIRED IN THIS MANNER. LOSS OF BOTH THESE ITEMS, WITH SUCH A VAGUE LABEL OF THE ASSOCIATED FUSE, COULD POSE FUTURE PROBS, ESPECIALLY IN HIGH DENSITY TFC AREAS IN IFR FLT.
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.