FAA airworthiness directive publication
AD 2005-20-25
2005-10-12 · Final rule publication · Federal Register document 05-19928
This page records a selected historical publication. Its current legal status, applicability to an individual aircraft and compliance have not been determined. Consult the current FAA directive and aircraft configuration and maintenance records.
Literal model wording
Source publication: 2005-10-12 · Document 05-19928. Observation edition: selected-ad-source-text-extension-2.0.0.
These are exact source labels for discovery. Manufacturer identity remains unresolved. Serial numbers, installed equipment and all other conditions have not been evaluated. The complete applicability clause below retains all conditions and notes.
Original model and serial-number table
------------------------------------------------------------------------
Model Serial numbers
------------------------------------------------------------------------
401............... 655 and 401-0001 through 401-0322.
401A.............. 655 and 401A0001 through 401A0132.
401B.............. 401B0001 through 401B0221.
402............... 402-0001 through 402-0322.
402A.............. 402A0001 through 402A0129.
402B.............. 402B0001 through 402B0122, 402B0201 through
402B0249, 402B0301 through 402B0455, 402B0501
through 402B0640, 402B0801 through 402B0935,
402B1001 through 402B1100, 402B1201 through
402B1250, and 402B1301 through 402B1384.
402C.............. 689, 402C0001 through 402C0125, 402C0201 through
402C0355, 402C0401 through 402C0528, 402C0601
through 402C0653, 402C0801 through 402C0807, and
402C0808 through 402C1020.
404............... 682, 404-0001 through 404-0136, 404-0201 through 404-
0246, 404-0401 through 404-0460, 404-0601 through
404-0695, and 404-0801 through 404-0859.
411............... 642 and 411-0001 through 411-0250.
411A.............. 411-0251 through 411-0300.
414............... 667, 414-0001 through 414-0099, 414-0151 through 414-
0175, 414-0251 through 414-0280, 414-0351 through
414-0437, 414-0451 through 414-0550, 414-0601
through 414-0655, 414-0801 through 414-0855, and
414-0901 through 414-0965.
414A.............. 414A0001 through 414A0121, 414A0201 through
414A0340, 414A0401 through 414A0535, 414A0601
through 414A0680, 414A0801 through 414A0858, and
414A1001 through 414A1212.
421............... 693 and 421-0001 through 421-0200.
421A.............. 421A0001 through 421A0158.
421B.............. 421B0001 through 421B0056, 421B0101 through
421B0147, 421B0201 through 421B0275, 421B0301
through 421B0486, 421B0501 through 421B0665, and
421B0801 through 421B0970.
421C.............. 421C0001 through 421C0171, 421C0201 through
421C0350, 421C0401 through 421C0525, 421C0601
through 421C0715, 421C0801 through 421C0910,
421C1001 through 421C1115, 421C1201 through
421C1257, 421C1401 through 421C1413, and 421C1801
through 421C1807.
425............... 425-0001 through 425-0236.
441............... 698 and 441-0001 through 441-0362.
------------------------------------------------------------------------
Rows and serial-number conditions are reproduced as written; they are not an aircraft configuration or applicability determination.
401
401A
401B
402
402A
402B
402C
404
411
411A
414
414A
421
421A
421B
421C
425
441
These observations do not determine aircraft applicability, compliance, installed configuration or current legal status.
Applicability text in this publication
What Airplanes Are Affected by This AD?
(c) This AD affects the following airplane models and serial
numbers that are:
(1) Equipped with an avionics bus circuit breaker switch, part
number (P/N) CM3589-50, 593-250-101, 593-250-102, W31-X2M5A-50, or
W31-X1000-50; and
(2) certificated in any category:
------------------------------------------------------------------------
Model Serial numbers
------------------------------------------------------------------------
401............... 655 and 401-0001 through 401-0322.
401A.............. 655 and 401A0001 through 401A0132.
401B.............. 401B0001 through 401B0221.
402............... 402-0001 through 402-0322.
402A.............. 402A0001 through 402A0129.
402B.............. 402B0001 through 402B0122, 402B0201 through
402B0249, 402B0301 through 402B0455, 402B0501
through 402B0640, 402B0801 through 402B0935,
402B1001 through 402B1100, 402B1201 through
402B1250, and 402B1301 through 402B1384.
402C.............. 689, 402C0001 through 402C0125, 402C0201 through
402C0355, 402C0401 through 402C0528, 402C0601
through 402C0653, 402C0801 through 402C0807, and
402C0808 through 402C1020.
404............... 682, 404-0001 through 404-0136, 404-0201 through 404-
0246, 404-0401 through 404-0460, 404-0601 through
404-0695, and 404-0801 through 404-0859.
411............... 642 and 411-0001 through 411-0250.
411A.............. 411-0251 through 411-0300.
414............... 667, 414-0001 through 414-0099, 414-0151 through 414-
0175, 414-0251 through 414-0280, 414-0351 through
414-0437, 414-0451 through 414-0550, 414-0601
through 414-0655, 414-0801 through 414-0855, and
414-0901 through 414-0965.
414A.............. 414A0001 through 414A0121, 414A0201 through
414A0340, 414A0401 through 414A0535, 414A0601
through 414A0680, 414A0801 through 414A0858, and
414A1001 through 414A1212.
421............... 693 and 421-0001 through 421-0200.
421A.............. 421A0001 through 421A0158.
421B.............. 421B0001 through 421B0056, 421B0101 through
421B0147, 421B0201 through 421B0275, 421B0301
through 421B0486, 421B0501 through 421B0665, and
421B0801 through 421B0970.
421C.............. 421C0001 through 421C0171, 421C0201 through
421C0350, 421C0401 through 421C0525, 421C0601
through 421C0715, 421C0801 through 421C0910,
421C1001 through 421C1115, 421C1201 through
421C1257, 421C1401 through 421C1413, and 421C1801
through 421C1807.
425............... 425-0001 through 425-0236.
441............... 698 and 441-0001 through 441-0362.
------------------------------------------------------------------------
Effective-date text
This AD becomes effective on November 9, 2005.
Publication context
Historical effective date recorded in the publication: 2005-11-09. This date does not establish which directive controls today.
The publication records no affected prior directives in its Affected ADs paragraph. This says nothing about the number of directives applicable to an aircraft.
What Other ADs Are Affected By This Action?
(b) None.
Official sources
Read the Federal Register HTML publication · Read the official PDF publication
Sources retrieved: HTML 2026-09-08; PDF 2026-09-08.
The displayed text comes from the HTML publication. Refer to the official documents for the original wording.
This selected source edition is not a complete list of current airworthiness directives. Referenced manufacturer service documents are not reproduced here.