B757 crew was assigned a holding pattern with another aircraft at the same altitude in ZBW class a a...

Attributes
ACN	488349
Time
Date	200010
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	navaid : gdm.vortac
State Reference	MA
Altitude	msl single value : 24000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zbw.artcc
Operator	common carrier : air carrier
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Navigation In Use	other other vortac
Flight Phase	descent : holding
Route In Use	arrival : holding pattern
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zbw.artcc
Operator	general aviation : corporate
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Navigation In Use	other vortac
Flight Phase	descent : holding
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 170 flight time total : 14000 flight time type : 3000
ASRS Report	488349
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : multi engine pilot : instrument
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance non adherence : published procedure non adherence : required legal separation
Independent Detector	aircraft equipment : tcas other controllera other flight crewa other flight crewb
Resolutory Action	controller : separated traffic controller : issued new clearance flight crew : returned to assigned altitude none taken : detected after the fact
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 12000 vertical : 0
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Entered the hold at gdm where on the inbound leg when noticed on TCASII (no alert) another aircraft also at FL240. Tried to ask center, but before we could, aircraft started to climb to FL250 and we were instructed to descend to FL220 in the hold. Estimate by TCASII that aircraft going same direction between 2-3 mi at closest point. ATC never pointed them out or said anything to us. ATC was extremely busy. I do not know if either of us were at the wrong altitude, but suspect they were because they were asked to call center on the telephone. I believe they were a cpr jet.

Original NASA ASRS Text

Title: B757 CREW WAS ASSIGNED A HOLDING PATTERN WITH ANOTHER ACFT AT THE SAME ALT IN ZBW CLASS A AIRSPACE.

Narrative: ENTERED THE HOLD AT GDM WHERE ON THE INBOUND LEG WHEN NOTICED ON TCASII (NO ALERT) ANOTHER ACFT ALSO AT FL240. TRIED TO ASK CTR, BUT BEFORE WE COULD, ACFT STARTED TO CLB TO FL250 AND WE WERE INSTRUCTED TO DSND TO FL220 IN THE HOLD. ESTIMATE BY TCASII THAT ACFT GOING SAME DIRECTION BTWN 2-3 MI AT CLOSEST POINT. ATC NEVER POINTED THEM OUT OR SAID ANYTHING TO US. ATC WAS EXTREMELY BUSY. I DO NOT KNOW IF EITHER OF US WERE AT THE WRONG ALT, BUT SUSPECT THEY WERE BECAUSE THEY WERE ASKED TO CALL CTR ON THE TELEPHONE. I BELIEVE THEY WERE A CPR JET.

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.

B757 crew was assigned a holding pattern with another aircraft at the same altitude in ZBW class a airspace.