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Air carrier dispatchers and flight crews have problem coordinating new drift down alternates when a route over mountainous terrain is amended or changed.
| Attributes | |
| ACN | 178206 |
| Time | |
| Date | 199105 |
| Day | Fri |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : adm |
| State Reference | OK |
| Altitude | msl bound lower : 33000 msl bound upper : 33000 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zfw |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 178206 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | other personnel |
| Qualification | other |
| Events | |
| Anomaly | non adherence other other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
Flight plan planned route of flight was ama ALS gjt slc for flight from dfw to pdx. WX reroute came in with new route over adm-lbl-laa-gjt-flight plan route. Contacted dispatch to advise dispatcher of new route and request new en route alternate as is the procedure by company single engine drift down charts for aircraft. Dispatcher told captain acceptance of the new routing constituted acceptance of en route alternate airports are single engine drift down protection. Dispatch later provided information that gross weight over laa provided drift down protection for all terrain over rocky mountains. Crew computed same information in the interim time period. Dispatch said route analysis wasn't possible for random routing. Planners have to do study on programmed rtes only if gross weight of aircraft requires knowledge of drift down capabilities off canned rtes. Only a few people have that skill!
Original NASA ASRS Text
Title: ACR DISPATCHERS AND FLT CREWS HAVE PROBLEM COORDINATING NEW DRIFT DOWN ALTERNATES WHEN A ROUTE OVER MOUNTAINOUS TERRAIN IS AMENDED OR CHANGED.
Narrative: FLT PLAN PLANNED RTE OF FLT WAS AMA ALS GJT SLC FOR FLT FROM DFW TO PDX. WX REROUTE CAME IN WITH NEW RTE OVER ADM-LBL-LAA-GJT-FLT PLAN RTE. CONTACTED DISPATCH TO ADVISE DISPATCHER OF NEW RTE AND REQUEST NEW ENRTE ALTERNATE AS IS THE PROC BY COMPANY SINGLE ENG DRIFT DOWN CHARTS FOR ACFT. DISPATCHER TOLD CAPT ACCEPTANCE OF THE NEW ROUTING CONSTITUTED ACCEPTANCE OF ENRTE ALTERNATE ARPTS ARE SINGLE ENG DRIFT DOWN PROTECTION. DISPATCH LATER PROVIDED INFO THAT GROSS WT OVER LAA PROVIDED DRIFT DOWN PROTECTION FOR ALL TERRAIN OVER ROCKY MOUNTAINS. CREW COMPUTED SAME INFO IN THE INTERIM TIME PERIOD. DISPATCH SAID RTE ANALYSIS WASN'T POSSIBLE FOR RANDOM ROUTING. PLANNERS HAVE TO DO STUDY ON PROGRAMMED RTES ONLY IF GROSS WT OF ACFT REQUIRES KNOWLEDGE OF DRIFT DOWN CAPABILITIES OFF CANNED RTES. ONLY A FEW PEOPLE HAVE THAT SKILL!
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.