<< >> NASA ASRS Report 361956, February 1997

A320 on gardner 2 STAR bos. Cleared cross bronc intersection 11000 ft 250 KTS programmed. Captain advised using runway 33L. Entered landing runway in FMS and did not notice the bronc restr deleted and the aircraft reverted to vertical speed mode. Controller questioned altitude and vectored for further descent.

Attributes
ACN	361956
Time
Date	199702
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : gdm airport : bos
State Reference	MA
Altitude	msl bound lower : 11000 msl bound upper : 17000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zbw
Operator	common carrier : air carrier
Make Model Name	A320
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent other
Route In Use	arrival star : star enroute : on vectors enroute airway : zbw
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : commercial
Experience	flight time last 90 days : 200 flight time total : 11000 flight time type : 1300
ASRS Report	361956
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : atp pilot : commercial
Experience	flight time last 90 days : 190 flight time total : 17500 flight time type : 4400
ASRS Report	361514
Events
Anomaly	altitude deviation : crossing restriction not met non adherence : clearance non adherence : published procedure
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

During descent to bronc intersection to cross at 11000 ft and 280 KTS, the captain was getting WX on the other radio and I entered the landing runway 33L into the FMS. This caused the restr at bronc (280 KTS/11000 ft) to delete itself. I had the aircraft selected to managed flight and did not observe that it changed to vertical speed and the restr deleted. Center realized that we probably would not make the restr and gave us a vector. No other traffic or conflicts. This would not occur if once a restr was pilot entered into the FMS it would not automatically delete itself when a destination runway is entered. A pilot entered restr should only be deleted by pilots, not the FMS. Especially since the airport is 39 NM beyond the restr at bronc intersection which is normally (250 KTS/11000 ft).

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Original NASA ASRS Text

Title: A320 ON GARDNER 2 STAR BOS. CLRED CROSS BRONC INTXN 11000 FT 250 KTS PROGRAMMED. CAPT ADVISED USING RWY 33L. ENTERED LNDG RWY IN FMS AND DID NOT NOTICE THE BRONC RESTR DELETED AND THE ACFT REVERTED TO VERT SPD MODE. CTLR QUESTIONED ALT AND VECTORED FOR FURTHER DSCNT.

Narrative: DURING DSCNT TO BRONC INTXN TO CROSS AT 11000 FT AND 280 KTS, THE CAPT WAS GETTING WX ON THE OTHER RADIO AND I ENTERED THE LNDG RWY 33L INTO THE FMS. THIS CAUSED THE RESTR AT BRONC (280 KTS/11000 FT) TO DELETE ITSELF. I HAD THE ACFT SELECTED TO MANAGED FLT AND DID NOT OBSERVE THAT IT CHANGED TO VERT SPD AND THE RESTR DELETED. CTR REALIZED THAT WE PROBABLY WOULD NOT MAKE THE RESTR AND GAVE US A VECTOR. NO OTHER TFC OR CONFLICTS. THIS WOULD NOT OCCUR IF ONCE A RESTR WAS PLT ENTERED INTO THE FMS IT WOULD NOT AUTOMATICALLY DELETE ITSELF WHEN A DEST RWY IS ENTERED. A PLT ENTERED RESTR SHOULD ONLY BE DELETED BY PLTS, NOT THE FMS. ESPECIALLY SINCE THE ARPT IS 39 NM BEYOND THE RESTR AT BRONC INTXN WHICH IS NORMALLY (250 KTS/11000 FT).

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.