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B. Propeller check WARNING IF THE AIRCRAFT IS EQUIPPED WITH A CONNECTOR ON THE FIREWALL, DISCONNECT THE MAGNETO CONNECTOR AND CONNECT IT TO THE MAINTENANCE CONNECTOR. IF THE AIRCRAFT IS NOT EQUIPPED WITH A CONNECTOR ON THE FIREWALL, DISCONNECT THE SPARK PLUGS. 1) Remove the engine cowlings — refer to 71-10-01. 2) Detect cracks by : — dye penetrant inspection for aluminum parts — refer to 20-00-14, — magnetic inspection for steel parts. 3) Check vertical alignment of the blades (Figure 601) Blades alignment is an operation which defines the position of the end of the blades in relation to each other. This alignment only shows the relative position of blades and not their real trajectory. a) Remove the key from the magneto selector. b) Set a rod against wing leading edge until it comes into contact with blade surface at the end. NOTE : In absence of rod, use a chair. c) Mark the position of the first blade. AAAA Validity : S / N 1 — 9999 601 61 -1 0-00 (BA) Page APR 99 d) Turn propeller until the opposite blade comes into the position of the first blade and mark the position of the second blade. I e) The gap between the two marks should be no more than 1/16 in (1.5 mm). 4) Propeller vibrations When there are vibrations in a power unit, it is sometimes difficult to specify if they originate from the engine or from the propeller. In most cases, it is possible to determine the vibration origin by observing the hub, with removed spinner, while engine runs between 1200 and 1500 RPM and by establishing whether or not the propeller hub turns in a plane which is perfectly horizontal. If propeller hub oscillates following a small orbit, vibration normally originates from propeller. If propeller hub does not follow such a trajectory, it is reasonable to think that vibration originates from engine. When an excessive vibration of power plant is due to a propeller vibration, the defect will require to return the propeller to the manufacturer or even to discard it. I AAAA Validity : S / N 1 — 9999 602 6 1 -1 0-00 (BA) Page APR 99 Vertical alignment of blades — Inspection / Check Figure 601 AAAA Validity : S / N 1 — 9999 61-10-00Page 603 (BA) APR 99 PAGE INTENTIONALLY LEFT BLANK I AAAA Validity : S / N 1 — 9999 Page 604 6 1 -1 0-00 (BA) APR 99 I PROPELLER ASSEMBLY REPAIR 1. REPAIR — PROPELLER A. Tools and consumable materials None B. Repair of the propeller CAUTION : NEVER TRY TO REMOVE A DEFECT WITH A HAMMER. Refer to "Propeller Owner's Manual & Log Book HARTZELL" delivered with the aircraft. AAAA Validity : S / N 1 — 9999 61 10-00 (BA) P aAgpeR8 90 91 中国通航网 www.ga.cn 通航翻译 www.aviation.cn 本文链接地址：TB20 MAINTENANCE MANUAL 61 螺旋桨 TB20飞机维护手册(19) |
