AD 60-19-01

60-19-01 SIKORSKY: Amdt. 199 Part 507 Federal Register September 10, 1960. Applies to All S-52-3 Helicopters.

Compliance required as indicated.

As a result of further investigation of the service history of the HO5S-1 (S-52-3) helicopters, the following retirement, replacement and inspection schedules must be accomplished at the times indicated:

(a) Effective immediately the following components must be retired from service at the hours of time in service indicated:

P/N S11-10-2200 Main Rotor Blade Assembly -1,100 hours.

P/N S11-15-1100 Tail Rotor Blades - 1,700 hours.

(b) Effective October 14, 1960, the following components must be replaced with the redesigned components indicated, if not already accomplished:

P/N S11-35-2006, Clutch Spindle, replace with P/N S11-35-2009.

P/N S11-35-2013, Clutch Spring, replace with P/N S11-35-2013-1.

P/N S11-35-2019, Free Wheel Unit Spring, replace with P/N S11-35- 2019-1.

P/N 13273, Bolt, Engine Fan, replacewith AN 76-10 Bolt.

(c) Effective October 14, 1960, the following shall be accomplished at the times indicated:

(1) The torque of the AN 76-10 bolts in the engine fan must be checked every 30 hours' time in service and retorqued if necessary to a minimum value of 370 inch- pounds. Bolts found with less than 300 inch-pounds torque must be replaced with new bolts. (Sikorsky Service Information Circular 1135-22 covers this subject.)

(2) Within the next 30 hours' time in service and every 30 hours' time in service thereafter, inspect the DSP4 bearing in the rotating scissors in accordance with Sikorsky Service Information Circular 1110-46 and replace bearing every 100 hours' time in service with new bearing. When DSP4 bearing is replaced by DSRP4 bearing, the DSP4 inspection and replacement schedule no longer applies.

(3) Within the next 30 hours' time in service and every 30 hours' time in service thereafter, inspect the DSP4 bearing in the damper arm in accordance withSikorsky Service Information Circular 1110-46 and replace bearing every 300 hours' time in service with new bearing. When DSP4 bearing is replaced by DSRP4 bearing, the DSP4 inspection and replacement schedule no longer applies.

This supersedes AD 60-04-06.