A320 flight crew reported missing a crossing restriction at spiek on the delta 4 arrival slc. The FM...

Attributes
ACN	1361990
Time
Date	201606
Local Time Of Day	1801-2400
Place
Locale Reference	SLC.Airport
State Reference	UT
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Make Model Name	A320
Operating Under FAR Part	Part 121
Flight Phase	Descent
Route In Use	STAR DELTA4
Flight Plan	IFR
Component
Aircraft Component	FMS/FMC
Person 1
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	Pilot Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Altitude Crossing Restriction Not Met Deviation - Altitude Overshoot Deviation - Procedural Published Material / Policy Deviation - Procedural Clearance Inflight Event / Encounter CFTT / CFIT

Narrative:

On the delta 4 arrival into slc was cleared to cross jammn at 17000. Had verified altitude restrictions with the pilot flying. Approaching the fix was cleared to descend via. PF selected 11000 for lowest restriction at magne. We were still in managed descent. Prior to spiek we both verified altitude and noticed we were low. The aircraft had reverted to vertical speed. Started the correction and advised ATC asking for a safe altitude. Was given 13000. We had visual on terrain and no TCAS warning. Was then cleared to maintain 11000 and given a runway assignment of 16L. Continued on downwind and cleared for a visual. The flight started with a three hour round trip. We had a mechanical upon return and changed planes. Had to wait for a security check on the plane prior to boarding. Then 2 mechanical issues. No catering bins; had to wait on that. Late push. Late arriving into slc. I feel fatigue was the main factor in catching the event immediately. The aircraft losing automation was the ultimate cause of the event but was preventable had we been more alert.

Original NASA ASRS Text

Title: A320 flight crew reported missing a crossing restriction at SPIEK on the DELTA 4 Arrival SLC. The FMGC had reverted to vertical speed with 11000 feet set. The flight crew detected the error just before ATC issued a low altitude alert. Fatigue was cited as a contributing factor.

Narrative: On the Delta 4 arrival into SLC was cleared to cross JAMMN at 17000. Had verified altitude restrictions with the pilot flying. Approaching the fix was cleared to descend via. PF selected 11000 for lowest restriction at MAGNE. We were still in managed descent. Prior to SPIEK we both verified altitude and noticed we were low. The aircraft had reverted to vertical speed. Started the correction and advised ATC asking for a safe altitude. Was given 13000. We had visual on terrain and no TCAS warning. Was then cleared to maintain 11000 and given a runway assignment of 16L. Continued on downwind and cleared for a visual. The flight started with a three hour round trip. We had a mechanical upon return and changed planes. Had to wait for a security check on the plane prior to boarding. Then 2 mechanical issues. No catering bins; had to wait on that. Late push. Late arriving into SLC. I feel fatigue was the main factor in catching the event immediately. The aircraft losing automation was the ultimate cause of the event but was preventable had we been more alert.

Data retrieved from NASA's ASRS site 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.

A320 flight crew reported missing a crossing restriction at spiek on the delta 4 arrival slc. The FMGC had reverted to vertical speed with 11000 feet set. The flight crew detected the error just before ATC issued a low altitude alert. Fatigue was cited as a contributing factor.