75-05-07 KING RADIO CORPORATION: Amendment 39-2100. Applies to Model KCS-55 Pictorial Navigation System (magnetic stabilized compass) units, specifically the Gyro Model KG-102 ( ), Part Number 060-0011-0, Serial Numbers 1000 to 1999 and all serial numbers preceded by the letter "P" and Indicator Models KI-525 ( ), Part Number 066-3029-00/01, Serial Numbers 1000 to 1999 and all serial numbers preceded by the letter "P". The Model KCS-55 systems may be installed on various types of aircraft.
Compliance: Required as indicated, unless already accomplished.
A) Within the next 25 hours' time in service after the effective date of this AD, check the aircraft compass system installed or the aircraft permanent maintenance record to determine if the KCS-55 pictorial navigation system is installed on the aircraft.
B) If, as a result of determination required in Paragraph A of this AD, a KCS-55 pictorial navigation system is installed, check the indicator KI-525 ( ) to determineif the serial number falls within those noted in the applicability statement and if the unit has been modified and identified as Mod 1. Also, check the KG 102 gyro and determine if the serial number falls within those noted in the applicability statement and that the unit has been modified and identified as Mod 6. If both units are so identified with the modification number, make an appropriate entry in the aircraft records indicating compliance with this AD.
C) If as a result of the determinations required by Paragraphs A and B of this AD unmodified KCS-55 Pictorial Navigation System units are installed, prior to further flight, install a placard on the instrument panel in clear view of the pilot which indicates:
"KCS-55 PICTORIAL NAVIGATION SYSTEM IS NOT TO BE USED FOR PRIMARY HEADING OR IFR FLIGHT IF IT IS SOLE GYROSCOPIC HEADING SOURCE" and operate the aircraft in accordance with this limitation.
D) On or before November 15, 1975, replace any KCS-55 pictorial navigation system units which fall within the Part Number and Serial Number designations set forth in the applicability statement with modified units which are identified in accordance with King Alert Service Bulletins KI 525-1 and KG 102-6 dated January 2, 1975, or subsequent revisions, as Mod 1 and Mod 6 respectively. When this paragraph has been complied with, Paragraph C of this AD is no longer applicable.
E) Any alternative means of compliance with this AD must be approved by the Chief, Engineering and Manufacturing Branch, FAA, Central Region.
This amendment becomes effective February 28, 1975.