AD 50-48-02

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AD Number:
50-48-02
Document Type:
AD Final Rules
Docket Number:
Unknown
Subject Heading:
Airworthiness Directives; COLLINS RADIO: Applies to All Model 51R-1 and 51R-2 Receivers Incorporat...Show more
Subject:
Receivers
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
Make:
Collins Radio
Model:
Receivers
Product Type:
Appliance
Product Subtype:
Affected AD:
Superseded AD:
Affected By:
Superseded By:
Service/Office:
Office of Primary Responsibility:
CFR Part Reference:
Part 39
Comments:
AIRWORTHINESS DIRECTIVES FINAL RULES: 50-48-02
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   Unknown

AMENDMENT:  

AD NUMBER:   50-48-02

SUBJECT HEADING:   Airworthiness Directives; COLLINS RADIO: Applies to All Model 51R-1 and 51R-2 Receivers Incorporating Allite or Thordarson 90/150 Cycle Filters in Their Tone Localizer Indicator Circuits and to All Model 51R-1 Receivers Which Have Not Been Modified in Accordance With Collins 51R-1 Service Bulletin Number 7a


ACTION:  

SUMMARY:  

DATES:  

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:  
50-48-02 COLLINS RADIO: Applies to All Model 51R-1 and 51R-2 Receivers Incorporating Allite or Thordarson 90/150 Cycle Filters in Their Tone Localizer Indicator Circuits and to All Model 51R-1 Receivers Which Have Not Been Modified in Accordance With Collins 51R-1 Service Bulletin Number 7a. This Note Applies Only to Receivers Installed in Air Carrier Aircraft.

Compliance required by July 1, 1951.

A. To minimize the possibility of complete or partial in-service failure of the 90/150 cycle tone localizer system, replace all Allite and Thordarson 90- and 150-cycle filters with Collins Radio Co. approved replacement filters as follows:

		REMOVE	
REPLACE

			ALLITE	
WITH

FUNCTION	COLLINS NO.	THORDARSON NO.	(SCHRADER) NO.	
COLLINS NO.

90 cycle	673 0160 00	T51677	C222220-1	
673 0206 00

150 cycle	673 0161 00	T51678	C222220-2	
673 0207 00

United Transformer Co. P/N F5024, 150 cycle filters, Collins P/N 673 0161 00, are satisfactory and should not be replaced.

(Collins 51R-1 and 51R-2 Service Bulletin No. 14 dated September 21, 1950, covers this same subject.)

B. To minimize the possibility of course reversal due to the loss of automatic gain control action, modify the Model 51R-1 receiver in accordance with Collins 51R-1 Service Bulletin No. 7a dated August 29, 1950.

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