G-iv flight crew experiences a TCAS TA at 5;000 ft and the flying captain climbs 500 ft thinking the...

Attributes
ACN	1149038
Time
Date	201402
Local Time Of Day	1201-1800
Place
Locale Reference	VNY.Airport
State Reference	CA
Environment
Flight Conditions	IMC
Aircraft 1
Make Model Name	Gulfstream IV / G350 / G450
Operating Under FAR Part	Part 91
Flight Phase	Initial Approach
Route In Use	Vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Initial Approach
Route In Use	Vectors
Flight Plan	IFR
Person 1
Function	Pilot Flying Captain
Qualification	Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 77 Flight Crew Total 4100 Flight Crew Type 950
Person 2
Function	Captain Pilot Not Flying
Experience	Flight Crew Last 90 Days 120 Flight Crew Total 6800 Flight Crew Type 3950
Events
Anomaly	Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy
Miss Distance	Vertical 500

Narrative:

A deviation in altitude occurred during initial approach to van nuys airport. I was hand flying the airplane due to turbulence encountered on descent. While on frequency with socal approach; we were given a heading of 070 degrees. We were level at 5;000 ft in IMC conditions with continued light to occasional moderate turbulence. At approximately 4 miles from kadie intersection; we were given a heading of 130 degrees to intercept the localizer and clearance for the ILS for runway 16R at vny. While in the turn to intercept the localizer with continued turbulence; we received a TA message from our TCAS system. I initially climbed thinking that there was traffic right below us. I increased our altitude to 5;500 ft. Upon further review of the TCAS we received an RA to descend. I complied with RA advisory and descended immediately. I leveled off back to 5;000 ft and intercepted the localizer for the ILS runway 16R at van nuys and landed. We notified socal approach of what we had experienced. Socal also advised us that traffic above us; a boeing 737; had responded to an RA to climb. After the flight; my co-captain and I took the initiative to contact the socal approach controller by phone to describe our experience. The socal approach controller thanked us for taking the initiative to call him. He understood why I felt the urgent need to climb. He indicated to us that there was never a loss of separation and safety was not compromised.

Original NASA ASRS Text

Title: G-IV flight crew experiences a TCAS TA at 5;000 FT and the flying Captain climbs 500 FT thinking the traffic is below. The traffic is above and a TCAS RA is generated to descend. A normal approach and landing ensues.

Narrative: A deviation in altitude occurred during initial approach to Van Nuys Airport. I was hand flying the airplane due to turbulence encountered on descent. While on frequency with SoCal Approach; we were given a heading of 070 degrees. We were level at 5;000 FT in IMC conditions with continued light to occasional moderate turbulence. At approximately 4 miles from KADIE Intersection; we were given a heading of 130 degrees to intercept the localizer and clearance for the ILS for Runway 16R at VNY. While in the turn to intercept the localizer with continued turbulence; we received a TA message from our TCAS system. I initially climbed thinking that there was traffic right below us. I increased our altitude to 5;500 FT. Upon further review of the TCAS we received an RA to descend. I complied with RA advisory and descended immediately. I leveled off back to 5;000 FT and intercepted the localizer for the ILS Runway 16R at Van Nuys and landed. We notified SoCal Approach of what we had experienced. SoCal also advised us that traffic above us; a Boeing 737; had responded to an RA to climb. After the flight; my Co-Captain and I took the initiative to contact the SoCal Approach Controller by phone to describe our experience. The SoCal Approach Controller thanked us for taking the initiative to call him. He understood why I felt the urgent need to climb. He indicated to us that there was never a loss of separation and safety was not compromised.

Data retrieved from NASA's ASRS site 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.

G-iv flight crew experiences a TCAS TA at 5;000 ft and the flying captain climbs 500 ft thinking the traffic is below. The traffic is above and a TCAS RA is generated to descend. A normal approach and landing ensues.