AD 90-05-09

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AD Number:
90-05-09
Document Type:
AD Final Rules
Docket Number:
89-ASW-23
Subject Heading:
Airworthiness Directives; TRACOR AEROSPACE, INCORPORATED TA-7800 Omega/VLF Navigation Systems, with...Show more
Subject:
Omega/VLFNavigation Systems
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
04/04/1990
Make:
Tracor Aerospace, Inc.
Model:
Navigation Systems
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Superseded AD: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Superseded By: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: 90-05-09
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   89-ASW-23

AMENDMENT:   39-6527

AD NUMBER:   90-05-09

SUBJECT HEADING:   Airworthiness Directives; TRACOR AEROSPACE, INCORPORATED TA-7800 Omega/VLF Navigation Systems, with Receiver Processor Unit (RPU)

ACTION:  

SUMMARY:  

DATES:   Effective April 4, 1990.

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:  
90-05-09 TRACOR AEROSPACE, INCORPORATED: Amendment 39-6527. Docket No. 89-ASW-23.

Applicability: TA-7800 Omega/VLF Navigation Systems, with receiver processor unit (RPU) Part Numbers (P/N) 138000-7004, -7007, -7017, -7114, -7115, -7117, -7124, -7125, -7127, -7204, -7224, -7227, and -7247 with software program No. 851001 or 851002 installed in, but not limited to, the following airplanes by certain Supplemental Type Certificates (STC): Boeing Models 707, 727, and 737; McDonnell Douglas MD-80, DC-8, DC-9; Lockheed Models L-382, Jetstar 1329; Beech Model 200; Cessna Model 441; Avions Marcel Dassault Model 20; Piper Model PA-42; Hawker Siddeley Model HS-125; Fairchild Swearingen SA226T(B); North American Rockwell Model NA-265, and General Dynamics Model 22 (Convair 880).

Compliance: Required as indicated, unless already accomplished.

To prevent navigation errors when using the Great Britain (GBR) radio station, which could result in loss of the aircraft, accomplish the following:

(a) Within the next 10 hours' time in service, accomplish the following:

(1) Fabricate a placard with the words, "DESELECT 58 PRIOR TO EACH FLIGHT" using letters 0.125 inches high or greater, or use the placard supplied by Tracor Aerospace in Service Bulletin (SB) 138000-00-01, dated January 24, 1989. Mount this placard on the uppermost part of each TA-7800 Omega/VLF Navigation Control Display Unit (CDU).

(2) Thereafter, prior to each flight and until the TA-7800 software Program No. 851001 or 851002 is replaced as described in paragraph (b), deactivate the GBR VLF radio station by deselecting 58 as follows:

(i) Turn the CDU function select switch to the TEST position.

(ii) Press the CLR (clear) function on the data keyboard.

(iii) Key 58 into the left window on CDU.

(iv) Press the ENT (enter) function on the data keyboard.

(v) Press CLR (clear), O, ENT (enter) functions on the data keyboard.

(vi) Verify the left window on the CDU displays "58 OFF" and the right window displays a single digit and the letter "O."

(b) Within 90 days after the effective date of this AD, remove the Tracor TA-7800 RPU P/N's 138000-7004, -7007, -7017, -7114, -7115, -7117, -7124, -7125, -7127, -7204, -7224, -7227, and -7247 with software program No. 851001 or 851002, and replace with Tracor TA-7800 RPU P/N's 138000-7004, -7007, -7017, -7114, -7115, -7117, -7124, -7125, -7127, -7204, -7224, -7227, and -7247 with software program No. 890201 or 890202 respectively.

(1) Verify the software identification numbers as follows:

(i) Turn the function select switch on the CDU panel to the TEST position.

(ii) Press CLR (clear), 19, ENT (enter) on the data keyboard.

(iii) Verify program No. 890201 or 890202 in the right-hand display of the CDU.

NOTE: Software program Nos. 890201 and 890202 replace software program Nos. 851001 and 851002, respectively.

(2) Add the software verification test procedure specified in (b)(1)(iii) above to the Limitations Section of the related FAA-approved Airplane Flight Manual Supplement (AFMS). This may be accomplished by inserting a copy of this AD in the AFMS Limitations Section.

(3) After verification of the software specified in (b)(1)(iii) above has been completed satisfactorily, remove and discard the "DESELECT 58 PRIOR TO EACH FLIGHT" placard.

(4) Replace the Tracor TA-7800 pilot guide, publication T7800-3A, Revisions 1 through 5, with Tracor publication T7800-3A, Revision No. 6, dated April 14, 1989, which lists software program Nos. 890201 and 890202.

NOTE: A revised pilot guide will be supplied by Tracor and shipped with each reworked receiver processor unit.

(c) In accordance with FAR Section 43.9, make a log book entry which shows compliance with this AD.

(d) An alternate means of compliance or adjustment of the compliance time, which provides an equivalent level of safety, may be used when approved by the Manager, Special Program Office, Aircraft Certification Service, FAA, Southwest Region, Fort Worth, Texas 76193-0190.

(e) Special flight permits may be issued in accordance with FAR Sections 21.197 and 21.199 to operate airplanes to a base in order to comply with the requirements of this AD.

This amendment (39-6527, AD 90-05-09) becomes effective on April 4, 1990.

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