Possible causes
Book sources - Wikipedia
https://en.wikipedia.org/wiki/Special:BookSources/1-52620-446-0ISBN - Wikipedia
https://en.wikipedia.org/wiki/ISBN_(identifier)Please Wait... | Cloudflare
https://publications.parliament.uk/pa/ld200102/ldselect/ldchin/25/2504.htm#a9
ZD576's service history
https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/554613/20161002-LEGACY_JSP886-V3P315-FaultReport-FINAL-O.pdf
https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/554613/20161002-LEGACY_JSP886-V3P315-FaultReport-FINAL-O.pdf
Incident
Attention Required! | Cloudflare
https://www.theregister.co.uk/2010/01/04/mull_of_kintyre_chinook_dead_horse/Please Wait... | Cloudflare
https://publications.parliament.uk/pa/ld200102/ldselect/ldchin/25/2501.htmMilitary Airworthiness
https://sites.google.com/site/militaryairworthiness