During an approach to cpr on the ILS runway 13, a B727 crew's GPWS activates to warn them that they have descended prior to reaching the point on the 29 mi arc that allows descent below 10400 ft.

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Attributes
ACN	638245
Time
Date	200411
Day	Sat
Local Time Of Day	0001 To 0600
Place
Locale Reference	navaid : ddy.vortac
State Reference	WY
Altitude	msl bound lower : 900 msl bound upper : 10400
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : d01.tracon tower : sfo.tower
Operator	common carrier : air carrier
Make Model Name	B727 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : 3 other vortac
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 30 flight time total : 7000 flight time type : 1450
ASRS Report	638245
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	altitude deviation : excursion from assigned altitude altitude deviation : crossing restriction not met non adherence : clearance non adherence : published procedure other spatial deviation
Independent Detector	aircraft equipment : gpws
Resolutory Action	controller : issued advisory flight crew : returned to assigned altitude flight crew : returned to original clearance flight crew : became reoriented
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

On ILS 3 29 DME arc to cpr, incorrectly started down to 8500 ft prior to 193 degree radial. Aircraft egpws alerted with 'caution' then 'terrain' warning. Terrain avoidance maneuver was executed and aircraft returned to 10400 ft. Altitude of 10000 ft was reported to cpr radio when asked and then 10400 ft when level. Approach to landing was continued without further incident.

Original NASA ASRS Text

Title: DURING AN APCH TO CPR ON THE ILS RWY 13, A B727 CREW'S GPWS ACTIVATES TO WARN THEM THAT THEY HAVE DSNDED PRIOR TO REACHING THE POINT ON THE 29 MI ARC THAT ALLOWS DSCNT BELOW 10400 FT.

Narrative: ON ILS 3 29 DME ARC TO CPR, INCORRECTLY STARTED DOWN TO 8500 FT PRIOR TO 193 DEG RADIAL. ACFT EGPWS ALERTED WITH 'CAUTION' THEN 'TERRAIN' WARNING. TERRAIN AVOIDANCE MANEUVER WAS EXECUTED AND ACFT RETURNED TO 10400 FT. ALT OF 10000 FT WAS RPTED TO CPR RADIO WHEN ASKED AND THEN 10400 FT WHEN LEVEL. APCH TO LNDG WAS CONTINUED WITHOUT FURTHER INCIDENT.

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.