BE ALERT FOR WHEN ATC CLEARS YOU FOR THE APPROACH! A classic CFIT accident that occurred 25 years ago changed the way we handle IFR flights, resulted in better charting, and IFR changes. Some aspects of the accident were so disturbing that, to this day, pilot examiners and flight instructors drill new IFR pilots on what the phrase "Cleared for Approach" means. On December 1, 1974, TWA Flight 514, a Boeing 727-231 was en route from Indianapolis to Washington's National Airport. Crosswinds at National were too much for the north-south runway, and flights were being diverted to Washington Dulles International Airport's Runway 12. Weather observations at Dulles showed a 900 ft ceiling and visibility of 3 to 7 miles in rain. Surface winds were from 070° at 25 to 28 knots, with gusts as high as 49 kt. At 10:42 a.m ATC cleared Flight 514 to Dulles via the Front Royal VOR and to maintain FL290. At 10:43 the flight was cleared down to FL 230 and to cross 40 nm west of Front Royal at that altitude. At 10:51 ATC gave the flight heading of 090° to intercept the R300 of the ARMEL VOR, to cross a point 25 nm west of ARMEL at 8000 and "...the 300 radial will be for the VOR approach to Runway 12 at Dulles, altimeter 29.74. The crew acknowledged. Cockpit voice recordings showed that the VOR was tuned and altimeters properly set. At 10:57 the crew again discussed the approach, including Round Hill intersection, the final approach fix, VASI, runway lights, and the airport diagram. At 11:09:22 TWA 514 struck the west slope of Mount Weather, about 25 nm from Dulles at an elevation of about 1670 ft. Seven crewmembers and 85 passengers perished in the crash. There were no survivors. Testimony following the accident indicated that ATC frequently vectored aircraft off published routes and cleared them to descend below altitudes published on the charts. Ironically, as early as 1970, both the U.S. Air Force and the airlines pointed out to the FAA that the statement “Upon receiving an Approach Clearance, the pilot should begin his descent to the Approach Altitude as soon as possible” published in the February 1970 issue of the AIM could be misinterpreted unless a specific altitude restriction was included in the clearance. This statement was deleted in May 1970; however the line used to indicate a change was not drawn in that page. Some pilots, including the TWA Crew, were not aware of this change. The NTSB found the causes of the crash to be: 1. Flight crew's decision to descend to 1800 ft before the aircraft had reached the approach segment where that minimum altitude applied (See Appendix 1). 2. Flight crew's failure to adhere to the MSA depicted on the IAP chart and to request a clarification of the clearance. However, two of the five-member NTSB dissented, identifying the cause to be the failure of ATC to issue altitude restrictions in accordance with the ATC handbook. TWA FLIGHT 514 LEGACY • • • At 11:01 the flight was cleared to 7000 ft and to proceed inbound to ARMEL VOR and to expect the VOR/DME approach to Runway 12. • At 11:04 the flight reported level at 7000, and five seconds later the controller said, "TWA Five-Fourteen, you're cleared for a VOR/DME approach to Runway One-Two." The captain acknowledged this. • Worldwide implementation of pilot responsibilities and actions after receiving an Approach Clearance. (USA: CFR 14 91.175. PANAMA: Libro X Artículo 134) GPWS since December 1975 is mandatory. Modification of Automated Radar Terminal System (ARTS) alerting ATC when aircraft deviate from predetermined altitudes while flying in a Terminal Area. Mandatory exchange incident reporting system between airlines that is intended to identify unsafe operating conditions in order that they can be corrected before an accident occurs. The U.S.A FAA keeps oversight. Introduction of the MSA symbol on Approach Chart. APPENDIX 1 10:51 “TWA 514 at 44 nm from FFR turn left heading 090 to intercept Radial 300 of the ARMEL VOR Cross 25 nm inbound to ARMEL VOR at 8000” 10:59 “TWA 514 leaving 11000 for 8000” 11:01 “TWA 514 descend and maintain 7000” 11:02 “TWA 514 out of 10.000 for 7000” 11:01 “TWA 514 Proceed inbound to ARMEL, Expect VOR/DME RWY 12” 11:04 “TWA 514 is maintaining 7000” 11:09 "514 Cleared VOR/DME Approach RWY12" Cleared for VOR/DME RWY 12, TWA 514”
