gas, when confined to an enclosed area such as a guncompartment, is highly explosive. The gun gas purgesystem cools the barrels and purges gas from thecompartment during gun firing operations.The gun gas purge system in the F-14aircraft usescold air from the refrigeration system to cool and purgeresidual gun gases from the ammunition drum and guncompartment. The subsystem, activated when gunfiring is initiated, remains active for a 30-second periodafter gun firing to ensure that all gases are cooled andpurged.The F/A-18 gun gas purge system uses engine bleedair and has an additional gas control provided by ahydraulically actuated ram-air scavenge door that opensautomatically during gun-firing operations. The gungasses are vented through louvers in the lower mold lineof the aircraft fuselage.REVIEW NUMBER 4Q1. What chute provides a path from the exit unit tothe adapter assembly?Q2. What chute provides a path from the transfer unitto the entrance unit of the drum?Q3. What is the purpose of the gun gas purge system?Q4. Describe the difference between the gun gaspurge systems of the F-14 aircraft and theF/A-18 aircraft.M61A1 GUN SYSTEMINSTALLATIONSLEARNING OBJECTIVE: Identify M61A1gun system installations to include those usedon the F/A-18 and F-14 aircraft.M6lA1 gun and ammunition handling systeminstallations have the same basic components.However, some components are peculiar to specificaircraft. These differences are discussed in thefollowing paragraphs.F/A-18 GUN SYSTEM INSTALLATIONThe F/A-18 M61A1 gun system (fig. 6-14) isinternally mounted in the nose of the aircraft on thecenter line. The fired projectiles exit the aircraft throughthe gun blast diffuser assembly, located just forward ofthe cockpit windscreen. Depending upon the missionFigure 6-14.—F/A-18 M61A1 gun installation.6-15
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