B737-300 WAS VECTORED BELOW THE PHX CLASS B AIRSPACE AT 4000 FT. THEY GOT A GPWS 'TERRAIN' WARNING.

Narrative

WHILE BEING VECTORED FOR AN ILS RWY 26 IN PHX FROM THE BRUSER ARR; WE WERE GIVEN A HDG OF APPROX 080 DEGS AND AN ALT OF 4000 FT. CONDITIONS WERE IMC. THE DOWNWIND VECTOR BECAME UNUSUALLY LONG. THE FREQ WAS JAMMED. WE WERE UNABLE TO GET A WORD IN. WE BECAME CONCERNED ABOUT OUR POS IN REGARDS TO KNOWN RISING TERRAIN TO THE E. AT THAT MOMENT; WE GOT A 'TERRAIN' ALERT FROM GPWS; FOLLOWED BY THE 'PULL UP' MESSAGE. ALTHOUGH THE FO WAS FLYING THE ACFT; I EXECUTED A FULL PWR PULL-UP. KNOWING THE TERRAIN WAS LOWER TO THE S; I ALSO TURNED TO 150 DEGS. THE ALERT SILENCED QUICKLY AND WE BROKE OUT ON TOP. OUR CALL TO ATC OF THE EVENT WAS COVERED. ATC CALLED US AND ASSIGNED US HDG 150 DEGS; WHICH WE HAD PREVIOUSLY TURNED TO. WE ADVISED ATC OF THE EVENT AND HIS REPLY WAS THAT WE 'SHOULD NOT HAVE GOTTEN ONE THERE.' THE REST OF THE APCH AND LNDG WERE UNEVENTFUL. I BELIEVE THAT ATC 'LOST' US IN THE BUSY FREQ AND WE WERE VECTORED OUT OF CLASS B AIRSPACE (4000 FT AT 15 DME PXR) AND ENDED UP DANGEROUSLY CLOSE TO THE MOUNTAINS E OF PHX. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE CAPT RPTED THE INCIDENT TO HIS CHIEF PLT. THE ACR ATC PROCS SPECIALIST CONTACTED THE P-50 SUPVR AND BRIEFED HIM ON THE INCIDENT. 3 DAYS THE SUPVR SAID IT WAS UNDER INVESTIGATION. THE ACR HAS HEARD NOTHING ELSE. THE CAPT SAID HE GREW UP AND LEARNED TO FLY IN THE PHX AREA. HE KNOWS THE TERRAIN THERE LIKE THE BACK OF HIS HAND.