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Printed page 12. PDF page 19.
Illustrated Parts Catalogue (IPC) specifies that the attaching bolts should be part number A211-8D. The specifications for these bolts are:- Part No. Shank length (inches) Diameter (inches) Thread Size A211-8D 0.8 0.1865-0.1895 10 UNF A211-8C 0.8 0.1605-0.1639 8 UNC A211-7DOpen official document at PDF page 19Aircraft Accident Report 1/92: BAC One-Eleven G-BJRT, 10 June 1990
Printed page 13. PDF page 20.
the investigation, and 78 of these were identified as A211-7D, the remaining two being A211-8D. The old windscreen, which had been fitted four years earlier, before the aircraft had been acquired by British Airways, had therefore been primarily attached byOpen official document at PDF page 20Aircraft Accident Report 1/92: BAC One-Eleven G-BJRT, 10 June 1990
Printed page 16. PDF page 23.
windscreen was designed to be secured with countersunk head bolts to British Standard A211-8D. This British Standard specifies that the British Standard number and the bolt part number shall not be applied on the bolts, but shall be clearly markedOpen official document at PDF page 23Aircraft Accident Report 1/92: BAC One-Eleven G-BJRT, 10 June 1990
Printed page 31. PDF page 38.
modification states, and its bolts are defined as ‘attaching parts' and are identified as A211-8Ds. The IPC for the 510 series, in contrast, is very clear in identifying the correct bolts. The bolts actually fitted to the defective windscreen were,Open official document at PDF page 38Aircraft Accident Report 1/92: BAC One-Eleven G-BJRT, 10 June 1990
Printed page 33. PDF page 40.
The outboard corner post fairing strip interposed an additional thickness and required A211-8D bolts, and these were specified for the attachment of the whole windscreen, even though in the majority of locations approximately five threads would be visible below anOpen official document at PDF page 40Aircraft Accident Report 1/92: BAC One-Eleven G-BJRT, 10 June 1990
Printed page 34. PDF page 41.
hand one. The job had been set up before he arrived and he noticed that the bolts were A211-8Ds. He recalled fitting A211-7D bolts the previous night, but he rationalised that the aircraft were old and of differing modification statesOpen official document at PDF page 41Aircraft Accident Report 1/92: BAC One-Eleven G-BJRT, 10 June 1990