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B757 captain discovers that diw is a NDB and the FMC will not accept it unless it is entered as diwnb.
| Attributes | |
| ACN | 808110 |
| Time | |
| Date | 200810 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : diw.ndb |
| State Reference | NC |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : preflight |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| ASRS Report | 808110 |
| Events | |
| Independent Detector | other flight crewa |
| Resolutory Action | other |
| Supplementary | |
| Problem Areas | Chart Or Publication Flight Crew Human Performance |
| Primary Problem | Chart Or Publication |
| Situations | |
| Publication | FMS Database |
Narrative:
When the first officer; who was to be the PF; loaded the route into the FMS (specifically the leg 'wolfo AR18 diw') the FMS accepted it as wolfo direct diw without any notification other than idented the via as direct. In the body of the flight plan diw is idented with the VOR frequency 116.0. The FMS will accept the route only if diw is idented as diwnb; as AR18 terminated at the NDB. I am certain this is a known problem but with the heightened sensitivity to lateral deviations I felt it should be reported. Had we not reviewed the route as per company policy; we would have departed with a route which while accurate; would have not contained all waypoints on the airway. Diw in the route plan is really diwnb. Identify diw in the routing portion of the flight plan as diwnb. List the frequency in the legs portion of the flight plan as whatever the NDB frequency might be (I don't recall).
Original NASA ASRS Text
Title: B757 CAPT DISCOVERS THAT DIW IS A NDB AND THE FMC WILL NOT ACCEPT IT UNLESS IT IS ENTERED AS DIWNB.
Narrative: WHEN THE FO; WHO WAS TO BE THE PF; LOADED THE RTE INTO THE FMS (SPECIFICALLY THE LEG 'WOLFO AR18 DIW') THE FMS ACCEPTED IT AS WOLFO DIRECT DIW WITHOUT ANY NOTIFICATION OTHER THAN IDENTED THE VIA AS DIRECT. IN THE BODY OF THE FLT PLAN DIW IS IDENTED WITH THE VOR FREQ 116.0. THE FMS WILL ACCEPT THE RTE ONLY IF DIW IS IDENTED AS DIWNB; AS AR18 TERMINATED AT THE NDB. I AM CERTAIN THIS IS A KNOWN PROB BUT WITH THE HEIGHTENED SENSITIVITY TO LATERAL DEVS I FELT IT SHOULD BE RPTED. HAD WE NOT REVIEWED THE RTE AS PER COMPANY POLICY; WE WOULD HAVE DEPARTED WITH A RTE WHICH WHILE ACCURATE; WOULD HAVE NOT CONTAINED ALL WAYPOINTS ON THE AIRWAY. DIW IN THE RTE PLAN IS REALLY DIWNB. IDENT DIW IN THE ROUTING PORTION OF THE FLT PLAN AS DIWNB. LIST THE FREQ IN THE LEGS PORTION OF THE FLT PLAN AS WHATEVER THE NDB FREQ MIGHT BE (I DON'T RECALL).
Data retrieved from NASA's ASRS site as of May 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.