Flight crew of medium large transport on approach to bos had TCASII RA to descend, below GS and at s...

Attributes
ACN	196145
Time
Date	199112
Day	Sat
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : bos
State Reference	MA
Altitude	msl bound lower : 1200 msl bound upper : 1700
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : bos
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent : approach descent other landing other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : flight engineer pilot : commercial pilot : cfi pilot : atp
Experience	flight time last 90 days : 150 flight time total : 4600 flight time type : 800
ASRS Report	196145
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 95 flight time total : 6000 flight time type : 600
ASRS Report	196225
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Flight orlando to boston on approach to logan airport. Approach control had given vectors to final. At 15 mi, coming from south, approach cleared us direct 'loner' (heading 002), descend to 3000 (intersection fix ILS 27). About 5 mi from 'loner' we were cleared direct 'ripit' (FAF), heading approximately 300, cross 'loner' at or above 1700, slow to 170 KTS, cross 'ripit' at 170 KTS, cleared for visual 27. After descending to 1700, within 1-2 mi from 'ripit', we got a TCASII warning -- traffic, traffic, which distracted us. I was flying manually and descended to 1580 looking for traffic. I climbed back immediately to 1700 (no traffic sighted), approach said they received a 'low altitude' warning, please check your altitude. We were already back at 1700 ft. As we crossed 'ripit' the TCASII was still going off saying 'traffic, traffic, descend, descend now' and I descended to 1 1/2 dots below GS. At same time, we had a 'below GS' warning -- pullup, pullup. First officer contacted tower to confirm. There was no traffic or any conflict. I climbed back to GS and 1000 ft AGL/MSL. Aircraft was stabilized (with TCASII still giving commands). All TCASII commands were erroneous. First officer turned off TCASII to transponder only. Flight landed normally. It was a very annoying and disturbing time for this type of distraction requiring evasive action based on false commands, one requiring immediate evasive action to descend below GS on final inside FAF, the other to pull up from ground proximity warning system.

Original NASA ASRS Text

Title: FLC OF MLG ON APCH TO BOS HAD TCASII RA TO DSND, BELOW GS AND AT SAME TIME RECEIVED COMMAND FROM GND PROX WARNING SYS TO PULL UP.

Narrative: FLT ORLANDO TO BOSTON ON APCH TO LOGAN ARPT. APCH CTL HAD GIVEN VECTORS TO FINAL. AT 15 MI, COMING FROM S, APCH CLRED US DIRECT 'LONER' (HDG 002), DSND TO 3000 (INTXN FIX ILS 27). ABOUT 5 MI FROM 'LONER' WE WERE CLRED DIRECT 'RIPIT' (FAF), HDG APPROX 300, CROSS 'LONER' AT OR ABOVE 1700, SLOW TO 170 KTS, CROSS 'RIPIT' AT 170 KTS, CLRED FOR VISUAL 27. AFTER DSNDING TO 1700, WITHIN 1-2 MI FROM 'RIPIT', WE GOT A TCASII WARNING -- TFC, TFC, WHICH DISTRACTED US. I WAS FLYING MANUALLY AND DSNDED TO 1580 LOOKING FOR TFC. I CLBED BACK IMMEDIATELY TO 1700 (NO TFC SIGHTED), APCH SAID THEY RECEIVED A 'LOW ALT' WARNING, PLEASE CHK YOUR ALT. WE WERE ALREADY BACK AT 1700 FT. AS WE CROSSED 'RIPIT' THE TCASII WAS STILL GOING OFF SAYING 'TFC, TFC, DSND, DSND NOW' AND I DSNDED TO 1 1/2 DOTS BELOW GS. AT SAME TIME, WE HAD A 'BELOW GS' WARNING -- PULLUP, PULLUP. FO CONTACTED TWR TO CONFIRM. THERE WAS NO TFC OR ANY CONFLICT. I CLBED BACK TO GS AND 1000 FT AGL/MSL. ACFT WAS STABILIZED (WITH TCASII STILL GIVING COMMANDS). ALL TCASII COMMANDS WERE ERRONEOUS. FO TURNED OFF TCASII TO TRANSPONDER ONLY. FLT LANDED NORMALLY. IT WAS A VERY ANNOYING AND DISTURBING TIME FOR THIS TYPE OF DISTR REQUIRING EVASIVE ACTION BASED ON FALSE COMMANDS, ONE REQUIRING IMMEDIATE EVASIVE ACTION TO DSND BELOW GS ON FINAL INSIDE FAF, THE OTHER TO PULL UP FROM GND PROX WARNING SYS.

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.

Flight crew of medium large transport on approach to bos had TCASII RA to descend, below GS and at same time received command from ground proximity warning system to pull up.