An ex-Royal Air Force squadron leader says he warned bosses that Hercules aircraft not fitted with anti-explosive foam were at risk.
In 2005, a Hercules was shot down in Iraq killing 10 servicemen, and an inquiry said the lack of the foam in fuel tanks may have been to blame.
Sqn Ldr Chris Seal told the BBC he asked in 2002 for explosive suppressant foam (ESF) to be added to the fleet.
It is not known whether his request ever reached the Ministry of Defence.
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