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At San Juan the flight crew received a weather briefing from U.S. Weather Bureau personnel which 1ncluded the terminal forecasts issued by the U.S. Weather Bureau offices at JFK Airport, Boston, Detroit, and Washington, D. C., for a 24-hour period beginning at 1200 After making other preflight preparations, the same crew departed San Juan 1n N779PA at 1514 for JFK Airport operating as Pan American World Airways Flight 212 (FAA 212). The flight was conducted 1n accordance with an Instrument Flight Rules (IFR) clearance and was routine until arrival in the New York area. After descending and entering the holding pattern at the Colts Neon VOR at 1838, FAA 212 received the latest JFK weather which was below landing minimums. Consequently the flight proceeded to its alternate, Dulles International Airport and landed there at 1937.
The flight remained on the ground at Dulles for approximately 2-1/2 hours. During this time the aircraft was serviced, additional weather information was obtained by the crew, and an instrument flight plan was filed to JFK Airport.
The only required maintenance on N779PA at Dulles was the replacement of the No. 1 VOR nav1gation receiver. No other mechanical discrepanc1es were noted.
A dispatch release was received by Pan American Operations, Dulles Airport at 1938, and in part contained the following information route to be flown, flight time of 40 minutes, fuel burn off of 12,000 pounds, fuel required 37,000 pounds and a maximum takeoff gross weight of 202,000 pounds.
The company operations representative at Dulles stated… "the weight and balance was begun before the remote clearance was received and TOGW (takeoff gross weight) and DTW (dry tank weight) were entered in haste and in error in the limitations block. When the clearance was received I completed the flight plan/clearance and, in doing so, became immedlate1y aware of the error, but because of becoming; involved in problems with passenger and baggage removal the correction was not made immediately to the weight and balance … hurriedly finished it there in the galley, doing the addition in my head and again forgetting to correct the weight limitations block I delivered the papers to the cockpit and the flight left."
Examination of the load summary/weight and balance sheet for N779PA from Dulles to Kennedy showed the following
| Fuel stored | 21,380 pounds |
| Fuel required | 37,400 pounds |
| Taxi fuel | 2,000 pounds |
| Fuel at blocks | 60,780 pounds |
| BTW (dry tank weight) | 149,502 pounds |
| TOGW (takeoff gross weight) | 208,282 pounds |
| Weight at blacks | 210,282 pounds |
Examination of the flight plan and clearance sheet for N779PA from Dulles to Kennedy showed the following:
| Time en route | 36 minutes |
| Maximum TOGW | 202,000 pounds |
| Maximum LGW (landing gross wt.) | 190,000 pounds |
| Destination fuel | 12,000 pounds |
| Estimated TOGW | 210,000 pounds |
