TROUBLESHOOTING AIR DATA SYSTEM PADA PESAWAT BOEING B737 CLASSIC GA DI HANGGAR 4 GARUDA MAINTENANCE FACILITY

RIZAL ZARKASI, MUHAMMAD (2020) TROUBLESHOOTING AIR DATA SYSTEM PADA PESAWAT BOEING B737 CLASSIC GA DI HANGGAR 4 GARUDA MAINTENANCE FACILITY. Tugas Akhir thesis, Institut Teknologi Dirgantara Adisutjipto.

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Abstract

The air data system on the Boeing 737 Classic consists of an air data instrument and two air data computers. Which are air data instruments are mach / airspeed indicator, altimeter, and vertical speed indicator. The combination of a pneumatic altimeter and an airspeed indicator provides a standby indicator. The value of the computed airspeed and mach number will be displayed on the mach / airspeed indicator combination of pitot static air pressure data processed by computer data. This system has various problems. One of the problems is when the mach indicator doesn't show the right result. Troubleshooting is needed to solve the problems with the above Air data system. The way to solve the problem when the mach indicator does not show the right results on the Boeing 737 Classic is starting by performing an operational test on the Air data system. There are two ways to perform operational tests on the Air data system, namely Bite test and System test. After doing this checking, a problem was found with the mach indicator. After the Operational Test of the Air Data System on the Boeing 737 Classic aircraft and it was found that the mach indicator was damaged, we had to carry out further tests. The tests carried out are in the form of testing on the Mach indicator case, airspeed capsule, pointer needle, and finally the accuracy of the airspeed. And found a problem with the mach indicator case. Therefore, according to the Component Maintenance Manual, the way to troubleshoot this problem is to replace the mach indicator case with a serviceable one. After replacing the mach indicator case, it is required to carry out the operational test again on the Air data system. At the time of the operational test, the needle on the mach indicator can operate normally and according to the provisions. This shows the system and components have returned to a serviceable state and can be used again.

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