While operating within mode C veil, a light aircraft pilot failed to activate transponder and to adhere to see and avoid concept, resulting in near midair collision with bizjet.

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Attributes
ACN	304210
Time
Date	199505
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : cmk airport : hpn
State Reference	NY
Altitude	msl bound lower : 2800 msl bound upper : 2800
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : n90
Operator	general aviation : instructional
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	cruise other descent other
Flight Plan	None
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	other : unknown
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : instrument pilot : private
Experience	flight time last 90 days : 6 flight time total : 330 flight time type : 250
ASRS Report	304210
Person 2
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Events
Anomaly	conflict : nmac non adherence : far other anomaly other
Independent Detector	other controllera other flight crewa
Resolutory Action	none taken : insufficient time
Consequence	Other
Miss Distance	horizontal : 100 vertical : 500
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Inadvertent mode C veil error led to near miss with bizjet on ILS runway 16 into hpn. Commenced recurrency from 9 month layoff with BFR on apr/tue/95 and apr/thu/95. On may/tue/95 completed 10 touch-and-goes at hpn when tower cleared me for full stop due to mounting inbound IFR traffic. Exited runway, stopped, cleaned up airplane. Decided to fly hpn-cmk-croton-hpn to practice VOR tracking and departed runway 11, forgetting to turn on transponder. Called N90 3-5 mi east of croton point and received/entered squawk code recognizing at that instant that transponder was off. Corrected. Moments later saw a bizjet pass off to left in front of my plane. N90 reprimanded me on the radio and I acknowledged my error. Factors: layoff, break in routine (departure to cmk after touch-and-goes) forgot to use checklist, mental fatigue after touch-and-goes (should have packed it in then).

Original NASA ASRS Text

Title: WHILE OPERATING WITHIN MODE C VEIL, A LIGHT ACFT PLT FAILED TO ACTIVATE XPONDER AND TO ADHERE TO SEE AND AVOID CONCEPT, RESULTING IN NMAC WITH BIZJET.

Narrative: INADVERTENT MODE C VEIL ERROR LED TO NEAR MISS WITH BIZJET ON ILS RWY 16 INTO HPN. COMMENCED RECURRENCY FROM 9 MONTH LAYOFF WITH BFR ON APR/TUE/95 AND APR/THU/95. ON MAY/TUE/95 COMPLETED 10 TOUCH-AND-GOES AT HPN WHEN TWR CLRED ME FOR FULL STOP DUE TO MOUNTING INBOUND IFR TFC. EXITED RWY, STOPPED, CLEANED UP AIRPLANE. DECIDED TO FLY HPN-CMK-CROTON-HPN TO PRACTICE VOR TRACKING AND DEPARTED RWY 11, FORGETTING TO TURN ON XPONDER. CALLED N90 3-5 MI E OF CROTON POINT AND RECEIVED/ENTERED SQUAWK CODE RECOGNIZING AT THAT INSTANT THAT XPONDER WAS OFF. CORRECTED. MOMENTS LATER SAW A BIZJET PASS OFF TO L IN FRONT OF MY PLANE. N90 REPRIMANDED ME ON THE RADIO AND I ACKNOWLEDGED MY ERROR. FACTORS: LAYOFF, BREAK IN ROUTINE (DEP TO CMK AFTER TOUCH-AND-GOES) FORGOT TO USE CHKLIST, MENTAL FATIGUE AFTER TOUCH-AND-GOES (SHOULD HAVE PACKED IT IN THEN).

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.