“This soundtrack is intended to illustrate the correct way of giving verbal instructions over the intercom throughout the approach and attack at night, by the crew of a Liberator aircraft fitted with a Mk 5 radar and Leigh Light. It differs only slightly for crews flying other types of aircraft equipped with different forms of radar and illuminants. In this example my crew are not very experienced but they do know their gen and their crew drill is good.“ Soundtrack continues with communications between crew members and captain in simulation of sortie. Mix of British and Canadian(?) crew voices featured and aircraft captain gives a step by step commentary of the progress of the sortie.