B727 aircraft on vector for arrival level at assigned altitude when clearance for speed change is given. PF, captain, allowed aircraft to descend 300 ft when altitude alert sounded reminding flight crew to maintain assigned altitude.

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Attributes
ACN	392480
Time
Date	199801
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : den
State Reference	CO
Altitude	msl bound lower : 13700 msl bound upper : 14000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : den
Operator	common carrier : air carrier
Make Model Name	B727 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	cruise other descent other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Function	flight crew : first officer
Qualification	other other : other pilot : commercial pilot : flight engineer pilot : instrument pilot : atp
Experience	flight time last 90 days : 135 flight time total : 6800 flight time type : 2000
ASRS Report	392480
Person 2
Affiliation	company : air carrier
Function	flight crew : second officer
Qualification	other other : other pilot : instrument pilot : flight engineer pilot : commercial pilot : atp
Experience	flight time last 90 days : 60 flight time total : 4000 flight time type : 60
ASRS Report	392557
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

On vector for runway 16 to den off of arrival. Assigned 14000 ft. Level at 14000 ft when given speed change to 170 KTS. When I looked back inside aircraft captain had descended to 13700 ft. I called '14000 ft' and captain made immediate climb back to 14000 ft. Off altitude for maximum 15 seconds.

Original NASA ASRS Text

Title: B727 ACFT ON VECTOR FOR ARR LEVEL AT ASSIGNED ALT WHEN CLRNC FOR SPD CHANGE IS GIVEN. PF, CAPT, ALLOWED ACFT TO DSND 300 FT WHEN ALT ALERT SOUNDED REMINDING FLC TO MAINTAIN ASSIGNED ALT.

Narrative: ON VECTOR FOR RWY 16 TO DEN OFF OF ARR. ASSIGNED 14000 FT. LEVEL AT 14000 FT WHEN GIVEN SPD CHANGE TO 170 KTS. WHEN I LOOKED BACK INSIDE ACFT CAPT HAD DSNDED TO 13700 FT. I CALLED '14000 FT' AND CAPT MADE IMMEDIATE CLB BACK TO 14000 FT. OFF ALT FOR MAX 15 SECONDS.

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.