A g-v failed to capture 14;000 ft set in the mode control panel to comply with an ATC assign crossin...

Narrative:

On descent while flying the arrival procedure; I was given a clearance to cross an arrival intersection 'at' 14;000 ft. I reset the altitude alerter to 14;000 ft and selected 'vpath' for the vertical mode of operation. The autopilot was on and the descent mode. At this point in the flight the pilot not flying; was out of the seat to use the lavatory prior to landing. All was in order so I looked at the FMS to review the ATIS information and to further review the arrival. A double check if you will. During this time my attention was diverted from the primary flight display. The automation did not in fact capture the assigned altitude but kept descending until I looked and saw the altimeter at 13;300 ft. I immediately disconnected the autopilot and autothrottles and corrected the aircraft back to 14;000 ft as assigned. As I was leveling back to 14;000 ft; the pilot not flying returned to his station and inquired of me what had happened. A short exchange took place and we pressed on with the flight. No instruction or challenge was made by ATC and no conflict indicated by the TCAS. Shortly thereafter I was given a further descent to 8;000 ft and the rest of the flight proceeded normally.for a long period of time after this flight concluded; I evaluated my performance of duties and identified the source of the occurrence. I failed to adequately monitor the specific flight path of the aircraft during a critical time in the flight. I got complacent with my duty and I believe it was because for so many years of operating this equipment; never had the automation failed to perform as it had been set up. I fully believed that it would do as always; and as such; allowed myself to occupy my attention with other aspects of the flight. Worse; I allowed this to happen when the other pilot was away from his station. I did not discipline myself to avoid distraction from the primary duty when it was necessary that I perform specifically! To avoid said occurrence; or any similar occurrence; it is imperative to pay complete attention to the primary displays while performing flight operations. Complacency contributed directly to this deviation and indeed; does not have any place on the flight deck.

Original NASA ASRS Text

Title: A G-V failed to capture 14;000 FT set in the Mode Control Panel to comply with an ATC assign crossing restriction but the pilot failed to detect the error until 13;000 FT.

Narrative: On descent while flying the arrival procedure; I was given a clearance to cross an arrival intersection 'at' 14;000 FT. I reset the altitude alerter to 14;000 FT and selected 'VPATH' for the vertical mode of operation. The autopilot was on and the descent mode. At this point in the flight the pilot not flying; was out of the seat to use the lavatory prior to landing. All was in order so I looked at the FMS to review the ATIS information and to further review the arrival. A double check if you will. During this time my attention was diverted from the primary flight display. The automation did not in fact capture the assigned altitude but kept descending until I looked and saw the altimeter at 13;300 FT. I immediately disconnected the autopilot and autothrottles and corrected the aircraft back to 14;000 FT as assigned. As I was leveling back to 14;000 FT; the pilot not flying returned to his station and inquired of me what had happened. A short exchange took place and we pressed on with the flight. No instruction or challenge was made by ATC and no conflict indicated by the TCAS. Shortly thereafter I was given a further descent to 8;000 FT and the rest of the flight proceeded normally.For a long period of time after this flight concluded; I evaluated my performance of duties and identified the source of the occurrence. I failed to adequately monitor the specific flight path of the aircraft during a critical time in the flight. I got complacent with my duty and I believe it was because for so many years of operating this equipment; never had the automation failed to perform as it had been set up. I fully believed that it would do as always; and as such; allowed myself to occupy my attention with other aspects of the flight. Worse; I allowed this to happen when the other pilot was away from his station. I did not discipline myself to avoid distraction from the primary duty when it was necessary that I perform specifically! To avoid said occurrence; or any similar occurrence; it is imperative to pay complete attention to the primary displays while performing flight operations. Complacency contributed directly to this deviation and indeed; does not have any place on the flight deck.

Data retrieved from NASA's ASRS site as of July 2013 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.

Attributes
ACN	1059249
Time
Date	201301
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Gulfstream V / G500 / G550
Operating Under FAR Part	Part 91
Flight Phase	Descent
Flight Plan	IFR
Component
Aircraft Component	Altitude Hold/Capture
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	Pilot Not Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Altitude Overshoot Deviation - Procedural Clearance

A g-v failed to capture 14;000 ft set in the mode control panel to comply with an ATC assign crossing restriction but the pilot failed to detect the error until 13;000 ft.