<< >> NASA ASRS Report 712145, October 2006

A B757-200 flight crew flying the jckts departure out of atl had a waypoint drop out of the FMS. They later had the altitude drop out of the FMS also.

Attributes
ACN	712145
Time
Date	200610
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : atl.airport
State Reference	GA
Altitude	msl single value : 5000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : a80.tracon
Operator	common carrier : air carrier
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	climbout : initial
Route In Use	departure : on vectors departure sid : jackts
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 180 flight time total : 10500 flight time type : 3000
ASRS Report	718145
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	aircraft equipment problem : less severe non adherence : clearance non adherence : published procedure other spatial deviation
Independent Detector	other controllera other flight crewa
Resolutory Action	controller : provided flight assist controller : issued new clearance flight crew : returned to intended or assigned course
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance
Primary Problem	Ambiguous

Narrative:

On vector departure from atl from runway 8L; tower assigns initial heading of 080 degrees. Filed 'SID' is jckts 3. Established on 080 degree heading; atl departure clears our flight direct to hrshl. After entering direct hrshl in FMS; hrshl drops out as active waypoint. Reselected jckts 3 SID on FMS; but could not get hrshl to come back up on legs page. Advised ATC and ATC put our flight on vectors. ATC eventually cleared us direct to zelan on the departure and FMS/LNAV worked properly. Flight continued without incident. Also worth noting is that during departure the programmed cruise altitude dropped out of the FMS further supporting a momentary problem with FMS as cause of discrepancy on departure.

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Original NASA ASRS Text

Title: A B757-200 FLT CREW FLYING THE JCKTS DEP OUT OF ATL HAD A WAYPOINT DROP OUT OF THE FMS. THEY LATER HAD THE ALT DROP OUT OF THE FMS ALSO.

Narrative: ON VECTOR DEP FROM ATL FROM RWY 8L; TWR ASSIGNS INITIAL HDG OF 080 DEGS. FILED 'SID' IS JCKTS 3. ESTABLISHED ON 080 DEG HDG; ATL DEP CLRS OUR FLT DIRECT TO HRSHL. AFTER ENTERING DIRECT HRSHL IN FMS; HRSHL DROPS OUT AS ACTIVE WAYPOINT. RESELECTED JCKTS 3 SID ON FMS; BUT COULD NOT GET HRSHL TO COME BACK UP ON LEGS PAGE. ADVISED ATC AND ATC PUT OUR FLT ON VECTORS. ATC EVENTUALLY CLRED US DIRECT TO ZELAN ON THE DEP AND FMS/LNAV WORKED PROPERLY. FLT CONTINUED WITHOUT INCIDENT. ALSO WORTH NOTING IS THAT DURING DEP THE PROGRAMMED CRUISE ALT DROPPED OUT OF THE FMS FURTHER SUPPORTING A MOMENTARY PROB WITH FMS AS CAUSE OF DISCREPANCY ON DEP.

Data retrieved from NASA's ASRS site as of January 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.