Please provide some explenation with answer 12. On an MMEL category Citems are t
ID: 1717462 • Letter: P
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Please provide some explenation with answer 12. On an MMEL category Citems are to be repaired A. within 3 days of discovery. C. within 120 days of discovery B. within 10 days of discovery. D. immediately 13. On a Bell 212, the 90 gearbox A. reduces the speed. is at the bottom of the tail fin. case has an external lubricant reservoir. includes a chip detector. 14. During balancing, most newer helicopters have the tail rotor balanced by adding C. center weights. A. spanwise weights at the tips. D. weights near the hub. B. chordwise weights on the tips. 15. Many newer helicopters are rigged to the A. neutral C. upright B. extreme D. down 16. A dynamic pressure test is used to check the A. fuselage for air leaks. C. dump valve. B. pressure relief valve. D. fuselage for structural integrity. 17. Helicopters usually employ A. a gravity fuel feed system. tandem main rotors. C. honeycomb, bonded, and metal structures. D. ECU systems. 18. Which one of the following is true concerning MMELs? A. All items on the MMEL are identified with the ATA 200 code system. B. The remark OM means that only an operational procedure is required. C. MMELs and CDLs include the same type of items. D. Items required by the ANOs must be operative for fight. 19, An engine thrust of 12800 pounds is approximately equivalent to newtons. C. 5811 1277 2878 D. 56934 20. Database software falls into the classification. A. utility C. application B. operating system D. desktop accessory amination, Lesson 3Explanation / Answer
Tandem Rotor
Tandem rotor (sometimes referred to as dual rotor)
helicopters have two large horizontal rotor assemblies; a
twin rotor system, instead of one main assembly, and a
smaller tail rotor. [Figure 5-9] Single rotor helicopters need
an anti-torque system to neutralize the twisting momentum
produced by the single large rotor. Tandem rotor helicopters,
however, use counter-rotating rotors, with each canceling
out the other’s torque. Counter-rotating rotor blades will not
collide with and destroy each other if they flex into the other
rotor’s pathway. This configuration also has the advantage
of being able to hold more weight with shorter blades, since
there are two sets. Also, all of the power from the engines can
be used for lift, whereas a single rotor helicopter uses power
to counter the torque.
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