File under: Why we check the tower lights every day (or have an automated tower light reporting system):
56 years ago, on September 16, 1953 American Airlines flight 723 flew between the center and northeast towers of the WPTR antenna system while attempting to land at Albany County Airport. The plane crashed about 3/10 mile away near NY route 5 (Central Avenue) killing all 28 persons on board. To date, this is the worst aviation accident in the Albany, NY area.
Several years ago while cleaning out different AM transmitter site, I found a bunch of files about this accident in the trash bin. It seems that some engineer had moved a file cabinet during the great consolidation of the 1990’s to the wrong transmitter site. In any case, I rescued the file and for your reading pleasure, have scanned the following documents:
Retel WPTR north and center towers struck three hundred foot level 0930 morning 16 September by American Airlines Convair. Damage inspected afternoon 16 September by representative Zane Construction and afternoon 17 September by engineer Ideco tower used in array. Both report slight damage to center tower requiring straightening above 300 foot level. North tower has two legs bent result of wing passing through tower 18 inches above top guys at bolt intersection. Tower above bent and twisted but all right unless subject to high east wind. Impact sheered north beacon clevises and shattered glass. Replacement ordered and beacon restoration expected early next week. Measurements of directional pattern afternoon 16 September show pattern unchanged and mulls, base currents and loop currents within tolerances except center loop current which reads ten percent low. Indications are center pickup loop has been jarred and pattern unaffected. FCC representative Turnbull who arrived noon Wednesday concurred. No time lost. Operating at full power
George Wetmore, Assistant Genl Mgr, Radio Station WPTR
This is the statement of the transmitter engineer on duty at the time of the crash.
I, Robert S. Henry engineer for Patroon Broadcasting Co. would like to make this statement concerning the collision of an American Airlines Plane with our transmitting towers.
On Wednesday morning September 16, 1953 I was on duty alone at the WPTR transmitter when at approximately 9:30 A.M. a low flying plane was heard overhead. The carrier trip circuit which protects the transmitting apparatus from sudden overloads at the antenna almost instantly actuated and a low sound of explosion followed about 3 seconds later. I ran to the back door of the transmitter in time to see what proved later to be aluminum sheets fluttering down through the fog. I estimate the ceiling at the time to have been approximately 75 feet and not sharply defined. The centre (sic) tower of our three tower array swayed violently for approximately for approximately (sic) 1 minute. At the time I knew a plane had hit the tower but it was above the ceiling and invisable to me. I called W. R. David and George Wetmore and the incident was reported to the Albany airport.
Back in these days, the studios were located at the Hendrick Hudson Hotel in Troy, the transmitter site was manned by a licensed transmitter engineer when ever the station was on the air.
What is amazing is that the IDECO towers remained standing after being struck by Convair 240, a pretty good sized aircraft.
Official report by the International Civil Aviation Organization:
American Airlines’ Flight 723 was a scheduled flight between Boston, and Chicago, with intermediate stops among which were Hartford (BDL), and Albany (ALB). The CV-240 arrived at Bradley Field at 06:57. Weather at the next stop, Albany, at this time was below the company’s landing minimums, but was forecast to improve to within limits by the time the flight arrived there. Departure from Bradley Field was made at 07:14. Because of poor visibility at Albany, several aircraft were in a holding pattern. The special Albany weather report issued at 07:50 indicated thin obscurement, ceiling estimated 4,000, overcast, fog, visibility 3/4 miles. Two aircraft left the holding pattern, attempted to land, but both executed a missed approach procedure. A third airplane landed at 08:16 following an instrument approach to runway 19. Immediately following this landing, Flight 723 was cleared to make an instrument approach to runway 19. Three minutes later the flight advised the tower that its approach was being abandoned because the aircraft’s flaps could not be lowered.
At 08:30 Albany Tower reported:”All aircraft holding Albany. It now appears to be pretty good for a contact approach from the west. It looks much better than to the north.” Flight 723 was then cleared for a contact approach to runway 10. On finals for runway 10, the Convair descended too low. The right wing of the aircraft struck the center tower of three radio towers at a point 308 feet above the ground. The left wing then struck the east tower. Seven feet of the outer panel of the right wing including the right aileron and control mechanism from the center hinge outboard together with 15 feet of the left outer wing panel and aileron separated from the aircraft at this time. Following the collision with the towers, ground impact occurred a distance of 1,590 feet beyond the tower last struck. First ground contact was made simultaneously by the nose and the left wing with the aircraft partially inverted.
The weather reported at the time of the accident was thin scattered clouds at, 500 feet, ceiling estimated 4500 feet, broken clouds, visibility 1-1/2 miles, fog.
PROBABLE CAUSE: “During the execution of a contact approach, and while manoeuvring for alignment with the runway to be used, descent was made to an altitude below obstructions partially obscured by fog in a local area of restricted visibility.”
The above reports notes that the aircraft traveled 1590 feet and struck the ground partially inverted. I do not know what the flaps up landing speed of a Convair CV-240 is but the cruising speed is 280 MPH. It would be safe to say the aircraft was traveling in the 120 to 130 MPH range or about 220 feet per second. At that speed, it was likely airborne for about 7 seconds after it hit the tower. Enough time to look out the window, realize what was happening and say “Oh, Shit!”
IDECO stood for the Internation Derrick Company, they build cranes, derricks and bridges as well as radio towers. Apparently they made pretty good stuff because those same towers are still standing today.
Not that checking the tower lights would have averted disaster in this case, it appears to be pilot error compounded by bad weather that caused this incident. But there have been more recent aircraft/radio tower accidents, some of which have involved possible faulty tower lights. I wouldn’t want that on my conscience.