Copy · Robinson SB89 R44 Service Bulletin · 6 pages

© Robinson. Filed by the FAA in regulations.gov docket FAA-2016-0733, the docket of AD 2016-26-04. Not covered by OpenAirDocs’ CC0 dedication.

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R44 SB-89 Page 3 of 6 C016-7 Main Rotor Blade Using a fine-point marker, mark trailing edge with a

4.0 - 4.2 inch line.

1.25 inches

• INBOARD Area to be removed

TRAILING EDGE

OUTBOARD I Using 10x magnification, RS 117.0 visually inspect upper and lower surfaces and trailing edge in this area. Verify no RS 124.0 cracks, corrosion, or damage such as nicks which may initiate a crack.

(VIEW LOOKING DOWN) FIGURE 1 MS3367-6-0 Ty-Rap Area to be removed R7769-6 Slit tube (VIEW LOOKING DOWN) FIGURE 2 (OVER)

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R44 SB-89 Page 4 of 6 Minimum 0.5 inch - bare metal - Correct inside radius (2 inches or greater)

INBOARD

0.25 inch minimum outside radius

TRAILING EDGE OUTBOARD →

4.0 - 5.0 inch Incorrect radius (smaller than 2.0 inches) diameter tube Gap (VIEW LOOKING DOWN) FIGURE 3 Upper skin Lower skin (MAGNIFIED VIEW OF TRAILING EDGE) FIGURE 4

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