Near midair collision between 2 small aircraft--both on training with student under hood.

Attributes
ACN	128832
Time
Date	198911
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : lwm
State Reference	MA
Altitude	msl bound lower : 3000 msl bound upper : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : bos
Operator	general aviation : instructional
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	descent other other
Flight Plan	IFR
Aircraft 2
Operator	general aviation : instructional
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	climbout : intermediate altitude cruise other
Flight Plan	None
Person 1
Affiliation	Other
Function	instruction : instructor oversight : pic
Qualification	pilot : cfi pilot : commercial
Experience	flight time last 90 days : 18 flight time total : 1280
ASRS Report	128832
Person 2
Affiliation	Other
Function	flight crew : single pilot
Qualification	other other : other
Events
Anomaly	non adherence : far other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : insufficient time
Consequence	Other
Miss Distance	horizontal : 250 vertical : 0
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

During an IFR training flight, bos approach approved our request for practice holding patterns over the haget NDB while on IFR flight plan. However, we were instructed to descend from 4000' MSL (base of the bos TCA over haget) to 3000' MSL. While in a right-hand turn to the outbnd heading of the published holding pattern, an small aircraft crossed within 250' of us, traveling left to right at 3000' MSL. The pilot of the small aircraft was wearing a hood and I did not spot the traffic prior to the initiation of the turn. (I was in the right-head seat.) the traffic was not called by bos approach. Both aircraft are required to have mode C since the incident occurred within 30 NM of bos. Although it was my responsibility as instrument to see and avoid, once the right-hand turn was started, I had limited visibility to the left due to the pilot's hood and the bank of the aircraft. Furthermore, my attention was directed to searching for traffic ahead of us and to our right (the direction of our turn). I believe the small aircraft had departed lwm and just reached 3000' MSL. In any case, although I was scanning for traffic, I did not see him until he was very close.

Original NASA ASRS Text

Title: NMAC BETWEEN 2 SMA--BOTH ON TRAINING WITH STUDENT UNDER HOOD.

Narrative: DURING AN IFR TRNING FLT, BOS APCH APPROVED OUR REQUEST FOR PRACTICE HOLDING PATTERNS OVER THE HAGET NDB WHILE ON IFR FLT PLAN. HOWEVER, WE WERE INSTRUCTED TO DSND FROM 4000' MSL (BASE OF THE BOS TCA OVER HAGET) TO 3000' MSL. WHILE IN A RIGHT-HAND TURN TO THE OUTBND HDG OF THE PUBLISHED HOLDING PATTERN, AN SMA CROSSED WITHIN 250' OF US, TRAVELING LEFT TO RIGHT AT 3000' MSL. THE PLT OF THE SMA WAS WEARING A HOOD AND I DID NOT SPOT THE TFC PRIOR TO THE INITIATION OF THE TURN. (I WAS IN THE RIGHT-HEAD SEAT.) THE TFC WAS NOT CALLED BY BOS APCH. BOTH ACFT ARE REQUIRED TO HAVE MODE C SINCE THE INCIDENT OCCURRED WITHIN 30 NM OF BOS. ALTHOUGH IT WAS MY RESPONSIBILITY AS INSTR TO SEE AND AVOID, ONCE THE RIGHT-HAND TURN WAS STARTED, I HAD LIMITED VISIBILITY TO THE LEFT DUE TO THE PLT'S HOOD AND THE BANK OF THE ACFT. FURTHERMORE, MY ATTN WAS DIRECTED TO SEARCHING FOR TFC AHEAD OF US AND TO OUR RIGHT (THE DIRECTION OF OUR TURN). I BELIEVE THE SMA HAD DEPARTED LWM AND JUST REACHED 3000' MSL. IN ANY CASE, ALTHOUGH I WAS SCANNING FOR TFC, I DID NOT SEE HIM UNTIL HE WAS VERY CLOSE.

Data retrieved from NASA's ASRS site as of August 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.