Advisory Bulletin A-26
ROTORWAY EXEC 162F · Service Bulletins
Overview
This document is an advisory bulletin (A-26) from RotorWay International addressing issues related to the secondary drive unit of the EXEC 162F and other models. It provides recommendations for upgrades and inspections to prevent high bearing temperatures and potential cracks in the keyway area.
- Upgrade secondary units with three bearings to the two bearing design.
- The two bearing design operates at lower temperatures.
- Inspection of the secondary shaft keyway area is required every 100 hours.
- Use a penetrant inspection kit to check for cracks in the secondary shaft.
- Radius the edges of the key before re-installation.
- Older units with three bearings may have higher operating temperatures.
Document
Source
Originally published by rotorwaydocumentation.link. Sprinkle hosts a reference copy with an added summary, specifications and searchable full text.
Document details
- Type ·
- Service Bulletins
- Year ·
- 1996
- File size ·
- 72 KB
- Publisher ·
- rotorwaydocumentation.link
- Language ·
- en
What is the Advisory Bulletin A-26?
The Advisory Bulletin A-26 is a service bulletins for the ROTORWAY EXEC 162F, dated 1996.
Where does the Advisory Bulletin A-26 come from?
This copy of the Advisory Bulletin A-26 was originally published by rotorwaydocumentation.link and is hosted on Sprinkle as a free, searchable reference copy.
What year was the Advisory Bulletin A-26 published?
The Advisory Bulletin A-26 — the ROTORWAY EXEC 162F service bulletins on file — is dated 1996.
Most owners only have the POH. Here's the essential set for the ROTORWAY EXEC 162F.
- Pilot's Operating Handbook / AFM
- Checklist
- Maintenance Manual
- Parts Catalog (IPC)
- Systems & Wiring
- Service Bulletins on file
- Type Certificate (TCDS)
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In this document
History
Feedback from customers highlighted issues with high bearing temperatures in the secondary shaft, particularly in the upper bearing area.
Action
RotorWay recommends upgrading to the two bearing design and performing regular inspections of the secondary shaft.
Inspection Procedure
The inspection involves removing the sprocket, cleaning the shaft, and using a penetrant inspection kit to check for cracks.
Key Installation
Before re-installing the key, it should be radiused to prevent stress and potential cracking.
Bearing Types
The document specifies serial numbers for secondary units with three bearings and those with two bearings.
Safety notes
- Improper installation of the key may induce stress and lead to cracks.
- Secondary units with three bearings are at risk of higher temperatures.
- Inspection should be performed at the earliest convenience if over 100 hours.
Full document text
INTERNATIONAL ROTORWA Y 4140 W. MERCURY WAY • CHANDLER BOULEVARD CHANDLER, AZ 85226 • USA PHONE (602) 961-1001 FAX (602) 961-1514 May 20, 1996 TO ALL EXEC, EXEC 90 and EXEC 162F OWNERS ADVISORY BULLETIN A-26 History: RotorWay has received feedback from customers regarding Bulletins M-11 (Exec 90 and 162F) and A-23 (Exec), which discussed installation of the secondary drive unit and operating temperatures of the upper secondary bearings. To this date, problems that have occurred with the secondary shaft were the result of high bearing temperatures and have occurred at the upper end of the shaft, primarily in the bearing area. As described in the previous bulletins, earlier secondary units with three bearings in the upper housing operate at higher temperatures than the current units with two bearings. This is confirmed by the use of temperature strips. Another item of concern has been the installation of the key between the sprocket and the shaft. If the key is improperly installed, stress may be induced into the keyway area, which could develop into a crack. Action: RotorWay International recommends that all secondary units with three bearings be upgraded to the current two bearing design. The two bearing design runs cooler, and uses double row ball bearings which are better suited for use where alignments and loads vary. Replacement of the upper secondary bearings will require sending the unit back to the factory, because the secondary is not a field serviceable component. Please contact the Parts Department to schedule this replacement. In addition, an inspection of the secondary shaft in the area of the keyway should be done every 100 hours. (If the aircraft already has more than 100 hours at this time, the inspection should be performed at the earliest convenience.) The inspection consists of the following: 1. Remove the sprocket from the secondary shaft. This involves removal of the chain. 2. Thoroughly clean the secondary shaft with solvent and acetone to remove oil. 3. Use a penetrant inspection kit to detect any cracks. There are two kits available from Aircraft Spruce and Specialty: Spotcheck Test Kit, part number SK-45 Met-L-Chek, part number 09-38304 Either kit will last for many years. Your local FBO may also be able to supply the kit or inspect the shaft. (continued) Advisory Bulletin A-26 Page 2 Before re-installing the key, radius the edges of the key where it contacts the shaft, as indicated by the arrows in the illustration below. The edges should have approximately a 1/16" radius. This can be done using a file, grinder, or sander. The example below shows the key after being radiused. Note: To verify which type of bearings are supplied on your secondary unit, check the serial number on the end of the secondary shaft. Secondary units with three bearings: All serial numbers up to 5280 (shipped before March, 1994) and numbers 5290, 5291, 5292, 5302, 5303. Secondary units with two bearings: All serial numbers above 5304 (shipped after September, 1994) and numbers 5281 to 5289, 5293 to 5301.