The bulletin
Text extracted from the PDF.
SPECIAL
AIRWORTHINESS
INFORMATION
BULLETIN
Aircraft Certification Service Washington, DC
U.S. Department of Transportation Federal Aviation Administration
CE-04-72 July 29, 2004 www.faa.gov/certification/aircraft This is information only. Recommendations aren’t mandatory.
Introduction
This Special Airworthiness Information Bulletin informs you, registered owners and operators of Cessna Aircraft Company models 150, 172, 177, 180, 182, 185, 188, 206, 207, 210 series airplanes (equipped with a VR600A voltage regulator (VR)), that Cessna has issued Owner Advisory SEB03- 3A and Service Bulletin SEB03-3 regarding voltage regulator replacement.
Background
Cessna received reports of undetected over-voltage conditions caused by internal failure of the VR installed in a Cessna Model 172N airplane. The airplane had a replacement VR installed, part number (P/N) VR600A, which Electrosystems, Inc., manufactured as an FAA-approved parts manufacturer approval (PMA). The VR is a replacement for Cessna P/N C6611001-0201 and is eligible for installation on Cessna airplanes equipped with a 14-volt system.
Installation instructions of the VR600A VR specify to remove the Cessna-installed over-voltage sensor and to modify the aircraft wiring. The VR600A drawing, dated 6/11/97, specifies that the VR600A is a solid-state VR containing internal over-voltage protection. After installation of a VR600A, the regulator is the only over-voltage protection on the airplane. If the regulator fails, the airplane electrical system is no longer protected.
Cessna’s Owners Advisory and Service Bulletin recommends compliance within 12 months or 100 hours, whichever occurs first. Cessna Service Kit SK210-170 is available and replaces voltage regulator P/N VR600A with Electrosystems VR600 voltage regulator. It also specifies reinstallation of the over-voltage sensor; and, if the airplane wiring had been modified, install the VR600A voltage regulator and return the wiring to the original manufacturer’s configuration.
Recommendation
We recommend that you consider incorporating the Owners Advisory and Service Bulletin.
For Further Information Contact
Roger Souter, Aerospace Engineer, FAA Wichita Aircraft Certification Office, 1801 Airport Rd, Rm 100, Wichita, KS 67209; phone: (316) 946-4134; email: roger.souter@faa.gov
Registered aircraft it may concern
Registry models matched by Cessna Aircraft Company, The 150, 172, 177 and 7 more, the same way as ADs, with the most registered aircraft first.