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FIT for FLIGHT II Lecture Notes and Practice MODULE 5 Letalska angleščina II FIT FOR FLIGHT II Lecture notes and practice MODULE 5: SYSTEM MAINTENANCE NIKA ZALAZNIK © [email protected] I Fit for Flight II ________________________________________________________________________________________________ CONTENTS 5 AIRCRAFT SYSTEM MAINTENANCE .................................................. 3 5.1 ELECTRICAL POWER ............................................................................................. 3 5.2 FUEL .......................................................................................................................... 9 5.3 HYDRAULIC POWER............................................................................................ 11 5.4 LANDING GEAR .................................................................................................... 13 5.5 WINGS ..................................................................................................................... 16 5.6 POWERPLANT ....................................................................................................... 18 5.7 SAFETY FIRST ....................................................................................................... 22 © II [email protected] Fit for Flight II ___________________________________________________________________________________________________ 5 AIRCRAFT SYSTEM MAINTENANCE Background information Aircraft Maintenance is a systematic, explicit and comprehensive process for the management of safety risks, that integrates operations and technical systems with financial management and human resources, for all activities relate to an air operator or an approved maintenance. The material contained in this module is for explanatory and language purposes only. Where existing systems or components have been referenced, the example is used for the purpose of clarity and to demonstrate the use of English. It is not my intention to advocate that particular systems be used. In keeping with performance based regulations, this module is intended to provide simplified technical English language details of the various regulatory maintenance requirements and to offer examples of possible ways these elements can be used. 5.1 ELECTRICAL POWER Vocabulary check Before you read this chapter, check that you know these important terms. Mark a tick () if you do. If you do not, use the glossary, a dictionary or ask your teacher. A turbofan engine is simply a turbine engine where the first stage compressor rotor is larger in diameter AC loom battery loss bundle network bus bar out of phase C/B pin charge plug clip relay contactor shed (v.) CSD shunt DC supply energise terminal fuse tie (v.) ground trip (v.) ground power voltage IDG wire kit wired load wiring diagram © 3 [email protected] Fit for Flight II ________________________________________________________________________________________________ 5.1.1 Electrical power sources A320: AMM 24.00.001 1 General Two integrated drive generators (IDG) normally supply the a/c electrical power in flight; each engine drives one generator. The APU drives a third, auxiliary generator (APU GEN) which can replace either main generator (GEN 1 or GEN 2). The generators supply the distribution network with alternating current. Two transformer rectifiers (TR) supply, in normal configuration, the distribution network with direct current. In the event of major failure, a constant-speed hydraulic motor drives an emergency generator (CSM/G) to supply the systems required for a/c control. On the ground, an electrical ground power unit (GPCU) can supply the a/c. Independent power supply is also possible from the APU GEN. 1 AMM – Aircraft Maintenance Manual (particular sections) © 4 [email protected] Fit for Flight II ___________________________________________________________________________________________________ A300: AMM 24.41.00 1 AC Generation A) 115/200 Volt Three-Phase Network The main source of electrical power is the two 400 Hz constant frequency 90 KVA AC generators, each of which is driven mechanically by an engine through a constant speed drive unit (SCD). Each generator supplies distribution bus bars via line contactors. Each generator is capable of supporting all the electrical loads through transfer contactors. A third generator, identical to the others, is driven directly at constant speed by an auxiliary power unit (APU). This generator ensures the electrical autonomy of the aircraft on the ground, and can be used in flight to compensate for the loss of one or both of the normal generators. B) 400 Hz Single-Phase 115 Volt AC Network A single-phase static inverter, supplied by the “emergency” DC bus bar, supplies the emergency AC bus bar in case of failure of the main AC network. Find an expression with the same meaning as »in the event of”. Put the following words in the correct tenses. One word can be used more than once. either … or, each, both, none, any, some, several, much, many, few, little, all 1 A _________________________ cans of oil. 2 How ___________________ cabin attendants are there on _____________ A300 normally? 3 There are ___________________ possible reasons for the failure. 4 The plane can fly on __________________ two engines ___________________ one engine. 5 How __________________ fuel do you need? 6 __________________ generator supplies distribution bus bars. 7 There is only a ________________ water in the tanks. 8 The generator can be used to compensate for the loss of one or ____________ of the normal generators. 9 Do you have __________________ questions? 10 No modification is necessary. Spares required: _________________________. 11 Aircraft affected: _______________________________. 12 Crew have reported _______________________ problems with this system. 13 Can I get you _______________ water? © 5 [email protected] Fit for Flight II ________________________________________________________________________________________________ Fill in the blanks in these sentences using expressions for conditions or possibilities: if/should, unless, provided that 1. ___________________________ there is a failure the back-up system will come on line. 2. ___________________________ the normal valve fails, the alternate valve will take over. 3. The a/c can depart _______________________ there are no No-go items. 4. If the APU is inoperative, the engines cannot be started ____________________ there is an air start unit. Revise the use of the Passive / Active voice Look at the structure of the sentences in italics in the A300 text and complete the table. ACTIVE SUBJECT VERB OBJECT, AGENT, etc. MEANS PASSIVE active (The) main is (the) two generators source of electrical power passive each of which is driven by an engine through a CSD. (=generators) Transform these sentences into the active mode. Example: PASSIVE The transformer rectifier is supplied by the 400 Hz, 115/200 volt, 3-phase network. ACTIVE The 400 Hz, 115/200 volt, 3-phase network supplies the transformer rectifier. 1 The fan is put into operation automatically by an electronic module. 2 The auxiliary TR supply contactor is de-energised by the relay. © 6 [email protected] Fit for Flight II ___________________________________________________________________________________________________ 3 The switch is closed by an overhaul signal. 4 The fan is supplied by the AC network. 5 The 3-phase supply is isolated by the relay. 5.1.2 Insulation damage A300: SB 24.0692 B Reason Several instances have been reported of damage to the insulation of some electrical cable looms at the wing-to-pylon interface. Such damage could be induced by chafing of cable looms against the retaining “P” clips created by variations in this zone. This modification replaces these “P” clips with a clamp block assembly mounted on a new support angle, thereby providing a firmer method of attachment and a decrease in the amount of bending of the looms at this position. C Description Embodiment of this modification on the a/c consist in: (1) Removing access panels at the top of the L.H. and R.H. pylons. (2) Removing and discarding some of the “P” clips attaching cable looms to a bracket fixed to the bottom surface of the wing leading edge skin. (3) Bolting of a new support angle to the bracket on the wing skin. (4) Installation of a new clamp block and the retained “P” clips to secure the cable looms to the new support angle. (5) Replacement of access panels. Find the words in the SB with the same meaning as these words: bundles area cases wires caused rubbing installed thus location ensuring Are these sentences TRUE or FALSE? »P« clips replace clamp assemblies. The modification reduces bending. The modification has five steps. You discard all »P« clips. You rivet the new support angle. The bracket is on the lower forward wing skin. 2 SB - Service Bulletin (particular sections) © 7 [email protected] Fit for Flight II ________________________________________________________________________________________________ 5.1.3 Wiring error SUBJECT: A320 ATA 24 – IDG MPU WIRING AND MMEL EMENDMENT 1 EVENT THE PURPOSE OF THIS TELEX IS TO INFORM ALL A320 OPERATORS THAT A NUMBER OF A320 IDG MAGNETIC PICK-UP (MPU) SPEED SENSORS WERE MANUFACTURED WITH THE NOISE CANCELLATION COIL WIRED IN REVERSE. IN THIS CONFIGURATION THE FUNCTION OF THE COIL IS NO LONGER REALISED AND IN FACT NOISE MAY BE ADDED ON THE MPU SIGNAL. 2 OPERATIONAL EFFECTS A NON-COMPLYING MPU NOISE CANCELLATION COIL IS ONLY KNOWN TO AFFECT NORMAL SYSTEM OPERATION AT ENGINE START. DURING
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