Tail Rotor Tracking
- The marking and electronic methods of tail rotor tracking are explained in the following paragraphs.
Marking Method :
Procedures for tail rotor tracking using
the marking method, are as follows:
• After
replacement or installation of the tail rotor hub, blades, or pitch change system,
check tail rotor rigging, and track tail rotor blades. Tail rotor tip clearance
shall be set before tracking and checked again after tracking.
• the strobe-type tracking device may be used if available. Instructions for use are
provided with the device. Attach a piece of soft rubber hose six inches long on
the end of a ½ × ½ inch pine stick or another flexible device. Cover the rubber hose
with Prussian blue or a similar type of coloring thinned with oil.
- Reset marking device on the underside of the tail boom assembly. Slowly move marking device into a disk of tail rotor approximately one inch from the tip.
- When a near blade is marked, stop the engine and allow rotor to stop. Repeat this procedure until the tracking mark crosses over to the other blade, then extend pitch control link of unmarked blade one-half turn.
Electronic Method :
- the electronic Vibrex balancing and tracking kit is housed in a carrying case and consists of a Model 177M-6A Balancer, a Model 135M-11 Strobex, track and balance charts, an accelerometer, cables, and attaching brackets.
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