Altitude deviation altitude undershot resulting in altitude crossing restriction not met.

Attributes
ACN	200478
Time
Date	199201
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : atl
State Reference	GA
Altitude	msl bound lower : 9000 msl bound upper : 11000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : cpa
Operator	common carrier : air carrier
Make Model Name	Light Transport, Low Wing, 2 Turboprop Eng
Navigation In Use	Other Other
Flight Phase	cruise other
Route In Use	arrival other arrival star : star enroute : direct enroute airway : atl
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 240 flight time total : 3300 flight time type : 1000
ASRS Report	200478
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 240 flight time total : 14000 flight time type : 120
ASRS Report	200735
Events
Anomaly	altitude deviation : undershoot altitude deviation : crossing restriction not met non adherence : clearance other anomaly other
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance flight crew : returned to intended course or assigned course other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

We were inbound to atlanta on the macy 1 arrival at 11000 ft about 60 NM out. ATC told us to cross 40 mis out at 9000 ft. The captain was flying. I was the first officer, working the radios. I read back the crossing restriction. The captain dialed in 9000 ft in the altitude alerter. Both the captain and myself simply forgot to descend. At about 38 DME ATC asked us our assigned altitude. We then realized we failed to descend. I read back our altitude and we descended immediately. As far as we know, there was no traffic conflict. A possible contributing factor could be lack of adequate rest. We were finishing a continuous duty overnight and had 4 1/2 to 5 hours sleep the night before. This was my second continuous duty in a row. Supplemental information from acn 200735: was not able to seep after going to bed. Got about 4 hours of sleep. Mentally, I was brain dead.

Original NASA ASRS Text

Title: ALTDEV ALT UNDERSHOT RESULTING IN ALT XING RESTRICTION NOT MET.

Narrative: WE WERE INBOUND TO ATLANTA ON THE MACY 1 ARR AT 11000 FT ABOUT 60 NM OUT. ATC TOLD US TO CROSS 40 MIS OUT AT 9000 FT. THE CAPT WAS FLYING. I WAS THE FO, WORKING THE RADIOS. I READ BACK THE XING RESTRICTION. THE CAPT DIALED IN 9000 FT IN THE ALT ALERTER. BOTH THE CAPT AND MYSELF SIMPLY FORGOT TO DSND. AT ABOUT 38 DME ATC ASKED US OUR ASSIGNED ALT. WE THEN REALIZED WE FAILED TO DSND. I READ BACK OUR ALT AND WE DSNDED IMMEDIATELY. AS FAR AS WE KNOW, THERE WAS NO TFC CONFLICT. A POSSIBLE CONTRIBUTING FACTOR COULD BE LACK OF ADEQUATE REST. WE WERE FINISHING A CONTINUOUS DUTY OVERNIGHT AND HAD 4 1/2 TO 5 HRS SLEEP THE NIGHT BEFORE. THIS WAS MY SECOND CONTINUOUS DUTY IN A ROW. SUPPLEMENTAL INFO FROM ACN 200735: WAS NOT ABLE TO SEEP AFTER GOING TO BED. GOT ABOUT 4 HRS OF SLEEP. MENTALLY, I WAS BRAIN DEAD.

Data retrieved from NASA's ASRS site as of July 2007 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.