Part 83, page 316

Transcript

The scan is the source; the transcript is machine-generated from it.

Q's A's AND If you have a question regarding Kaman Aircraft maintenance, send it along to Rotor Tips. The Service Department's analysts will be glad to answer it.

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Q. (Applies H-43B) WHAT COULD CAUSE A HEAVY DOWN LOAD ON THE COLLECTIVE PITCH STICK?

A. A malfunctioning rudder lock solenoid valve, P/N 7-V-7099, can cause this condition. Both the collective limiter and the rudder lock utilize oil pressure from the same stage of the transmission oil pump. Should the solenoid valve poppet fail to seat properly, it will allow the oil pressure to bleed by, thus robbing the collective limiter of its normal operating pressure and creating the stick down loads. The condition is most likely to occur with the DSAS switch "ON." To relieve the download, switch the DSAS "OFF." A future revision to T. O. 1H-43B-2 will include this troubleshooting information. Refer to handbook T. O. 9H8-4-132-3 for a detailed breakdown and troubleshooting chart on the solenoid valve. - W.J.W.

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Q. (Applies H-43A, H-43B) ARE THE BUBBLES SEEPING FROM THE SURFACE OF THE FIRE SUPPRESSION KIT AIR TANK AN INDICATION OF IMMINENT FAILURE?

A. No, the bubble seepage is due to normal expansion of the Fiberglas layers during charging of the tank. The expansion of the tank is normal. The tank, in the normal course of use, comes in contact with foam and water and the Fiberglas, being porous, allows the moisture to penetrate. When the tank is pressurized, expansion takes place at a greater rate inside the tank than outside and the moisture trapped within the Fiberglas is forced to the surface causing small bubbles to escape, thus giving the appearance of a leaking tank. - W.J.R.

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Q. (Applies HOK-1, HUK-1, H-43A, H-43B) WHAT ARE THE SIX "RIGHTS" OF LUBRICATION?

A. 1. The right type. 2. The right quality. 3. The right amount. 4. The right condition. 5. The right place. 6. The right time. - C.W.J.

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Q. (Applies HOK-1, HUK-1, H-43A, H-43B) WHAT IS THE PURPOSE OF THE TWO LOCK NUTS AT THE BASE OF THE AUXILIARY STRUT CYLINDER?

A. The lower nut is the gland nut which retains the piston wiper seal; and the upper nut establishes the freedom of the swivel of the strut and should never be over-tightened or strut-bind will occur. - F.E.S.

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Q. (Applies H-43B) WHAT IS THE MIL-SPEC FOR THE GRAY LACQUER USED IN THE H-43B COCKPIT AND CABIN?

A. The Mil-Spec for this lacquer is MIL-L-006805B. The number for the color, which is dark gull gray, is 36231. - F.E.S.

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Q. (Applies H-43B) IS THE DOWN STOP ON THE PILOT'S COLLECTIVE STICK RIGGED LOWER THAN THE STOP ON THE CO-PILOT'S STICK?

A. Yes, the pilot's collective stick down stop is rigged lower than the stop on the co-pilot's stick to insure full closing action of the collective limiter valve in the down direction. Centrifugal loads from the blade control rods and spring loads from the collective limiter cause a twisting action in the collective torque tubes. The pilot's down stop is rigged lower to compensate for this twisting action and assures positive pilot control of the collective limiter. Complete collective stop rigging procedures can be found in the latest issue of T. O. 1H-43B-2. - W.J.W.

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Q. (Applies HOK-1, HUK-1) WHY IS THERE A DIFFERENCE IN THE ALLOWABLE OVERSPEED IN THE 1340AN-48 AND -52 ENGINES?

A. The difference in allowable overspeed between the two engines is in relationship to the blower ratio. If an engine is driven to overspeed and the engine blower ratio is high and the compression ratio is the same for both engines, the detrimental effect of poor fuel-air mixture is added to the detriment of the overspeed. The engines are the same except for the impeller shaft intermediate gear assembly, the impeller shaft assembly and the carburetor elbow adapter. This is borne out by the operational difference in the manifold pressure. - A.A.W.

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Q. (Applies H-43B) SHOULD WASHERS OR SHIMS BE USED ON THE ENGINE MOUNTS?

A. Washers should be used only on the engine mounting bolts as required but neither washers nor shims should be used to fill the gap between the fitting, housing and rodends or bearings. The warning decal, "Do not use washers or shims on engine mounts,"

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is aimed at preventing this from occurring. The gaps between the right rear engine mount housing and the bolt head; the left rear housing and the fittings; the right forward rod ends and the housing and fitting; and the left forward rod end and fitting are necessary for engine expansion and operational torque loading. - A.A.W.

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Q. (Applies H-43B) IS IT PERMISSABLE TO MANUFACTURE THE MANUAL CARGO RELEASE WIRE, P/N K731570-23, LOCALLY AND, IF SO, WHAT PRECAUTION SHOULD BE OBSERVED?

A. It is permissable to manufacture this release wire locally, but the finished product must conform in all ways with the drawing specifications. Using a lighter gauge wire than the .040 specified can result in kinking and subsequent malfunctioning of the manual release. - W.J.R.

MANUAL RELEASE INSTL K731570

* NOTE 1095 K731570-23 WIRE (.040 MUSIC WIRE)

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KAMAN SERVICE ENGINEERING SECTION—G. D. Eveland, Supervisor, Service Engineering, E. J. Polaski, G. S. Gorf, Asst. Supervisors; E. L. White, A. Sevard, G. M. Lagueli, Group Leaders. ANALYSTS—R. A. Berg, P. M. Cummings, M. T. Fioschetti, P. A. Greco, E. Hermann, C. W. Jenkins, D. W. MacDonald, J. McMahon, W. J. Rudershausen, F. F. Starnes, W. J. Wagenacker, M. E. Wanner, A. A. Werkheiser, M. Whitmore, W. H. Zarling, R. W. Olsen.

AUGUST, 1962

KAMAN ROTOR TIPS

10 DB Cooper-36789 11