Medium Transport; Low Wing; 2 Turbojet Eng
Flight Crew Air Transport Pilot (ATP)
Communication Breakdown; Confusion
ATC Issue All Types; Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Clearance; Inflight Event / Encounter CFTT / CFIT
Air Traffic Control Issued New Clearance; Flight Crew Took Evasive Action; Flight Crew FLC complied w / Automation / Advisory
ATC Equipment / Nav Facility / Buildings; Human Factors; Procedure; Weather
We were in IMC conditions; cleared on the LDA Y RWY19 approach into DCA. There was no localizer signal. We let ATC know this and they realized that they had the wrong information and the airport was actually using the LDA Z RWY19 approach. So; they canceled the approach and vectored us left. We were at 170k and 2000 feet. In IMC we received a terrain warning; 'WOOP WOOP; PULL UP PULL UP'. So; I canceled the autopilot and pulled up. We contacted ATC and informed them of the action and warning and they assigned us altitude 3000 feet. We climbed to 3000 feet and that was the end of the event. They vectored us back around for the LDA Z RWY19 and we had a normal landing.
A flight crew was being vectored for an approach that was not in use. ATC realized their mistake when the crew reported no localizer signal. While being vectored for another approach; they received a terrain warning and climbed appropriately. They were then vectored around for a normal landing.