<< >> NASA ASRS Report 815393, December 2008

B737 flight crew receives low altitude alert from ATC during ILS 24 approach to isp. Crew started descent prior to localizer capture.

Attributes
ACN	815393
Time
Date	200812
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : isp.airport
State Reference	NY
Altitude	msl single value : 2000
Environment
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737-700
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Experience	flight time last 90 days : 242
ASRS Report	815393
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 175 flight time type : 6500
ASRS Report	815392
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : published procedure non adherence : far other spatial deviation
Independent Detector	atc equipment : msaw
Resolutory Action	flight crew : returned to assigned altitude
Consequence	other
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

We were at 2;000 ft vectored and cleared for the ILS 24 in isp. The CDI came alive and I set the next altitude of 1;500 ft. The captain started his descent as we were turning inbound on the localizer. The controller came on and said we were low and left of course. We climbed back to 2;000 ft; took a stronger intercept to get the course back. When all was checked and doublechecked; we continued the approach to an uneventful landing. Both pilots make sure the CDI is locked before a descent is made.

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Original NASA ASRS Text

Title: B737 flight crew receives low altitude alert from ATC during ILS 24 approach to ISP. Crew started descent prior to LOC capture.

Narrative: We were at 2;000 ft vectored and cleared for the ILS 24 in ISP. The CDI came alive and I set the next altitude of 1;500 ft. The Captain started his descent as we were turning inbound on the LOC. The Controller came on and said we were low and left of course. We climbed back to 2;000 ft; took a stronger intercept to get the course back. When all was checked and doublechecked; we continued the approach to an uneventful landing. Both pilots make sure the CDI is locked before a descent is made.

Data retrieved from NASA's ASRS site as of May 2009 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.