Altitude deviation altitude overshot during IAP ILS visual approach.

Attributes
ACN	203313
Time
Date	199202
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : jfk
State Reference	NY
Altitude	msl bound lower : 800 msl bound upper : 900
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : jfk
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	descent : approach
Route In Use	approach : visual
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : second officer
Qualification	pilot : flight engineer pilot : instrument pilot : commercial pilot : atp
Experience	flight time last 90 days : 55 flight time total : 7125 flight time type : 55
ASRS Report	203313
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : overshoot non adherence : published procedure non adherence : clearance other spatial deviation
Independent Detector	atc equipment other atc equipment : unspecified other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course other
Consequence	faa : reviewed incident with flight crew
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

During ILS approach to runway 4R at jfk a visual clearance to 4R was issued. Crew accepted the clearance to follow a widebody transport to runway 4R. An unintentional descent below the ILS glide path occurred triggering a low altitude alert at jfk tower. Prior to the alert the below glide path condition was recognized by the aircrew and an immediate correction was begun. An uneventful on-the-GS approach and landing followed. Jfk tower had no further comment during or after the approach. The glide path deviation was unintentional. The aircrew recognized the problem prior to the low altitude alert and began the corrective action in a timely and professional manner as did the jfk tower controllers. Contributing factors: low crew experience in the aircraft (air carrier X cockpit vice air carrier Y instrumentation). Improper instrument procedures (not xchking altitude while passing marker). Preoccupation with maintaining visual contact with preceding aircraft.

Original NASA ASRS Text

Title: ALTDEV ALT OVERSHOT DURING IAP ILS VISUAL APCH.

Narrative: DURING ILS APCH TO RWY 4R AT JFK A VISUAL CLRNC TO 4R WAS ISSUED. CREW ACCEPTED THE CLRNC TO FOLLOW A WDB TO RWY 4R. AN UNINTENTIONAL DSCNT BELOW THE ILS GLIDE PATH OCCURRED TRIGGERING A LOW ALT ALERT AT JFK TWR. PRIOR TO THE ALERT THE BELOW GLIDE PATH CONDITION WAS RECOGNIZED BY THE AIRCREW AND AN IMMEDIATE CORRECTION WAS BEGUN. AN UNEVENTFUL ON-THE-GS APCH AND LNDG FOLLOWED. JFK TWR HAD NO FURTHER COMMENT DURING OR AFTER THE APCH. THE GLIDE PATH DEV WAS UNINTENTIONAL. THE AIRCREW RECOGNIZED THE PROBLEM PRIOR TO THE LOW ALT ALERT AND BEGAN THE CORRECTIVE ACTION IN A TIMELY AND PROFESSIONAL MANNER AS DID THE JFK TWR CTLRS. CONTRIBUTING FACTORS: LOW CREW EXPERIENCE IN THE ACFT (ACR X COCKPIT VICE ACR Y INSTRUMENTATION). IMPROPER INST PROCS (NOT XCHKING ALT WHILE PASSING MARKER). PREOCCUPATION WITH MAINTAINING VISUAL CONTACT WITH PRECEDING ACFT.

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.