An air carrier aircraft departed sin (wsss) on the adpax 1X SID and entered restricted military airs...

Attributes
ACN	836472
Time
Date	200905
Local Time Of Day	1201-1800
Place
Locale Reference	WSSS.Airport
State Reference	FO
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Widebody Low Wing 2 Turbojet Eng
Operating Under FAR Part	Part 121
Flight Phase	Initial Climb
Route In Use	SID ADPAX 1X
Flight Plan	IFR
Component
Aircraft Component	FMS/FMC
Person 1
Function	Pilot Flying Captain
Qualification	Flight Crew Flight Instructor Flight Crew Flight Engineer Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 54 Flight Crew Total 7400 Flight Crew Type 925
Events
Anomaly	Aircraft Equipment Problem Less Severe Airspace Violation All Types Deviation - Procedural Clearance Deviation - Track / Heading All Types

Narrative:

We were filed and cleared for the adpax 1X (air defense exercise) SID from sin (singapore); departing runway 20C. Tower cleared us for takeoff and assigned us to fly runway heading. As the captain; I was the pilot flying this leg. Shortly after takeoff the autopilot was engaged. Still on runway heading and somewhere southwest of the field; the tower controller switched us to departure control. We were soon given the clearance to proceed direct to bobag and resume the adpax 1X SID. The first officer selected direct bobag in the FMS and I selected navigation. Since bobag and basix (the next fix on the SID) are both 'fly-by waypoints' and not 'fly-over waypoints' the FMC produced a track that drastically cut the corner to the east of bobag and basix on the way to adpax. Since the airbus FMS is certified to fly this way; I did not think anything of it. Shortly thereafter; ATC asked us if we were proceeding direct to bobag; and informed us that we had flown through restricted military airspace. We were then given a westerly heading to fly; and eventually cleared direct to basix. Again the FMC calculated a large short cut from our present position; to fly 'near' basix and then to adpax. Just to be sure; I took the airplane out of navigation mode and flew in heading select to get closer to basix before turning to adpax.

Original NASA ASRS Text

Title: An air carrier aircraft departed SIN (WSSS) on the ADPAX 1X SID and entered restricted military airspace after the FMS made wide turns near BOBAG and BASIX according to the 'Fly By' design parameters.

Narrative: We were filed and cleared for the ADPAX 1X (Air Defense Exercise) SID from SIN (Singapore); departing Runway 20C. Tower cleared us for takeoff and assigned us to fly runway heading. As the Captain; I was the pilot flying this leg. Shortly after takeoff the autopilot was engaged. Still on runway heading and somewhere southwest of the field; the Tower Controller switched us to departure control. We were soon given the clearance to proceed direct to BOBAG and resume the ADPAX 1X SID. The First Officer selected direct BOBAG in the FMS and I selected NAV. Since BOBAG and BASIX (the next fix on the SID) are both 'fly-by waypoints' and not 'fly-over waypoints' the FMC produced a track that drastically cut the corner to the east of BOBAG and BASIX on the way to ADPAX. Since the Airbus FMS is certified to fly this way; I did not think anything of it. Shortly thereafter; ATC asked us if we were proceeding direct to BOBAG; and informed us that we had flown through restricted military airspace. We were then given a westerly heading to fly; and eventually cleared direct to BASIX. Again the FMC calculated a large short cut from our present position; to fly 'near' BASIX and then to ADPAX. Just to be sure; I took the airplane out of NAV mode and flew in heading select to get closer to BASIX before turning to ADPAX.

Data retrieved from NASA's ASRS site as of April 2012 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.

An air carrier aircraft departed sin (wsss) on the adpax 1X SID and entered restricted military airspace after the FMS made wide turns near bobag and basix according to the 'fly by' design parameters.