Altitude deviation altitude excursion during evasive action dive descent in conjunction with TCASII RA. GPWS warning prevented aircraft from impacting rising terrain.

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Attributes
ACN	201637
Time
Date	199202
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : pdx
State Reference	OR
Altitude	agl bound lower : 500 agl bound upper : 1200
Environment
Flight Conditions	Mixed
Light	Dusk
Aircraft 1
Controlling Facilities	tracon : pdx
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : flight engineer pilot : cfi
Experience	flight time last 90 days : 210 flight time total : 5000 flight time type : 1000
ASRS Report	201637
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : cfi
Experience	flight time last 90 days : 150 flight time type : 1000
ASRS Report	201998
Events
Anomaly	aircraft equipment problem : critical altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	vertical : 200
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation other

Narrative:

Climbing through 1200 ft we had a TCASII RA and a command to descend at maximum rate (1500-2000 FPM). At 500 ft AGL we leveled off with TCASII still saying to descend at maximum rate. With high terrain approaching we started a maximum rate climb. (TCASII still saying descend maximum rate). TCASII showed a TA without an altitude ahead of us and a RA plus 200 ft behind us. Note: had we followed the TCASII directions we would have definitely crashed. If the WX had been IFR I feel we would have crashed following the TCASII directions. At one point we had TCASII saying descend maximum rate and the GPWS saying 'pull-up, pull-up.' ATC said he showed no traffic conflict at any time. Supplemental information from acn 201998. 'TCASII fail' displayed on CRT approximately 5 mins after takeoff. 'TCASII fail' should have been displayed sooner. 'RA' traffic at time of warning later ascertained to be 7 O'clock.

Original NASA ASRS Text

Title: ALTDEV ALT EXCURSION DURING EVASIVE ACTION DIVE DSCNT IN CONJUNCTION WITH TCASII RA. GPWS WARNING PREVENTED ACFT FROM IMPACTING RISING TERRAIN.

Narrative: CLBING THROUGH 1200 FT WE HAD A TCASII RA AND A COMMAND TO DSND AT MAX RATE (1500-2000 FPM). AT 500 FT AGL WE LEVELED OFF WITH TCASII STILL SAYING TO DSND AT MAX RATE. WITH HIGH TERRAIN APCHING WE STARTED A MAX RATE CLB. (TCASII STILL SAYING DSND MAX RATE). TCASII SHOWED A TA WITHOUT AN ALT AHEAD OF US AND A RA PLUS 200 FT BEHIND US. NOTE: HAD WE FOLLOWED THE TCASII DIRECTIONS WE WOULD HAVE DEFINITELY CRASHED. IF THE WX HAD BEEN IFR I FEEL WE WOULD HAVE CRASHED FOLLOWING THE TCASII DIRECTIONS. AT ONE POINT WE HAD TCASII SAYING DSND MAX RATE AND THE GPWS SAYING 'PULL-UP, PULL-UP.' ATC SAID HE SHOWED NO TFC CONFLICT AT ANY TIME. SUPPLEMENTAL INFO FROM ACN 201998. 'TCASII FAIL' DISPLAYED ON CRT APPROX 5 MINS AFTER TKOF. 'TCASII FAIL' SHOULD HAVE BEEN DISPLAYED SOONER. 'RA' TFC AT TIME OF WARNING LATER ASCERTAINED TO BE 7 O'CLOCK.

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.