Division Cessna 400 Series Aeroplanes - AD/CESSNA 400/113 - Avionics Bus Circuit Breaker Switch - Cessna 400 Series Aeroplanes

Cessna 400 Series Aeroplanes

AD/CESSNA 400/113	Avionics Bus Circuit Breaker Switch	13/2005

<table cellspacing="0" cellpadding="0" style="width:510.3pt; margin-top:0pt; margin-bottom:0pt; border-collapse:collapse"><tbody><tr><td style="width:74.35pt; padding-right:5.35pt; padding-left:5.35pt; vertical-align:top"><p><span>Applicability:</span></p></td><td colspan="2" style="width:414.55pt; padding-right:5.35pt; padding-left:5.35pt; vertical-align:top"><p><span>Cessna Model 400 aeroplanes as follows e</span><span>quipped with an avionics bus circuit breaker switch, part number (P/N) CM3589-50, 593-250-101, 593-250-102,</span><br><span>W31-X2M5A-50 or W31-X1000-50</span><span>:</span></p></td></tr><tr style="height:1.55pt"><td rowspan="12" style="width:74.35pt; padding-right:5.35pt; padding-left:5.35pt; vertical-align:top"><p><span></span></p></td><td style="width:72.65pt; padding-right:5.35pt; padding-left:5.35pt; vertical-align:top"><p style="margin-left:21.3pt; text-indent:-21.3pt"><span style="width:21.3pt; text-indent:0pt; display:inline-block"></span><span style="font-weight:bold">Model</span></p></td><td style="width:331.2pt; padding-right:5.35pt; padding-left:5.35pt; vertical-align:top"><p style="text-align:center"><span style="font-weight:bold">Serial Numbers</span></p></td></tr><tr style="height:1.3pt"><td style="width:72.65pt; padding-right:5.35pt; padding-left:5.35pt; vertical-align:top"><p style="margin-left:21.3pt; text-indent:-21.3pt"><span style="width:21.3pt; text-indent:0pt; display:inline-block"></span><span>401</span></p></td><td style="width:331.2pt; padding-right:5.35pt; padding-left:5.35pt; vertical-align:top"><p><span>655 and 401-0001 through 401-0322</span></p></td></tr><tr style="height:1.3pt"><td style="width:72.65pt; padding-right:5.35pt; padding-left:5.35pt; vertical-align:top"><p style="margin-left:21.3pt; text-indent:-21.3pt"><span style="width:21.3pt; text-indent:0pt; display:inline-block"></span><span>401A</span></p></td><td style="width:331.2pt; padding-right:5.35pt; padding-left:5.35pt; vertical-align:top"><p><span>655 and 401A0001 through 401A0132</span></p></td></tr><tr style="height:1.3pt"><td style="width:72.65pt; padding-right:5.35pt; padding-left:5.35pt; vertical-align:top"><p style="margin-left:21.3pt; text-indent:-21.3pt"><span style="width:21.3pt; text-indent:0pt; display:inline-block"></span><span>401B</span></p></td><td style="width:331.2pt; padding-right:5.35pt; padding-left:5.35pt; vertical-align:top"><p><span>401B0001 through 401B0221</span></p></td></tr><tr style="height:1.3pt"><td style="width:72.65pt; padding-right:5.35pt; padding-left:5.35pt; vertical-align:top"><p style="margin-left:21.3pt; text-indent:-21.3pt"><span style="width:21.3pt; text-indent:0pt; display:inline-block"></span><span>402</span></p></td><td style="width:331.2pt; padding-right:5.35pt; padding-left:5.35pt; vertical-align:top"><p><span>402-0001 through 402-0322</span></p></td></tr><tr style="height:1.3pt"><td style="width:72.65pt; padding-right:5.35pt; padding-left:5.35pt; vertical-align:top"><p style="margin-left:21.3pt; text-indent:-21.3pt"><span style="width:21.3pt; text-indent:0pt; display:inline-block"></span><span>402A</span></p></td><td style="width:331.2pt; padding-right:5.35pt; padding-left:5.35pt; vertical-align:top"><p><span>402A0001 through 402A0129</span></p></td></tr><tr style="height:1.3pt"><td style="width:72.65pt; padding-right:5.35pt; padding-left:5.35pt; vertical-align:top"><p style="margin-left:21.3pt; text-indent:-21.3pt"><span style="width:21.3pt; text-indent:0pt; display:inline-block"></span><span>402B</span></p></td><td style="width:331.2pt; padding-right:5.35pt; padding-left:5.35pt; vertical-align:top"><p><span>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</span></p></td></tr><tr style="height:1.3pt"><td style="width:72.65pt; padding-right:5.35pt; padding-left:5.35pt; vertical-align:top"><p style="margin-left:21.3pt; text-indent:-21.3pt"><span style="width:21.3pt; text-indent:0pt; display:inline-block"></span><span>402C</span></p></td><td style="width:331.2pt; padding-right:5.35pt; padding-left:5.35pt; vertical-align:top"><p><span>689, 402C0001 through 402C0125, 402C0201 through 402C0355, 402C0401 through 402C0528, 402C0601 through 402C0653, 402C0801 through 402C0807 and 402C0808 through 402C1020</span></p></td></tr><tr style="height:1.3pt"><td style="width:72.65pt; padding-right:5.35pt; padding-left:5.35pt; vertical-align:top"><p style="margin-left:21.3pt; text-indent:-21.3pt"><span style="width:21.3pt; text-indent:0pt; display:inline-block"></span><span>404</span></p></td><td style="width:331.2pt; padding-right:5.35pt; padding-left:5.35pt; vertical-align:top"><p><span>682, 404-0001 through 404-0136, 404-0201 through 404-0246,</span><br><span>404-0401 through 404-0460, 404-0601 through 404-0695 and</span><br><span>404-0801 through 404-0859</span></p></td></tr><tr style="height:1.3pt"><td style="width:72.65pt; padding-right:5.35pt; padding-left:5.35pt; vertical-align:top"><p style="margin-left:21.3pt; text-indent:-21.3pt"><span style="width:21.3pt; text-indent:0pt; display:inline-block"></span><span>411</span></p></td><td style="width:331.2pt; padding-right:5.35pt; padding-left:5.35pt; vertical-align:top"><p><span>642 and 411-0001 through 411-0250</span></p></td></tr><tr style="height:1.3pt"><td style="width:72.65pt; padding-right:5.35pt; padding-left:5.35pt; vertical-align:top"><p style="margin-left:21.3pt; text-indent:-21.3pt"><span style="width:21.3pt; text-indent:0pt; display:inline-block"></span><span>411A</span></p></td><td style="width:331.2pt; padding-right:5.35pt; padding-left:5.35pt; vertical-align:top"><p><span>411-0251 through 411-0300</span></p></td></tr><tr style="height:1.3pt"><td style="width:72.65pt; padding-right:5.35pt; padding-left:5.35pt; vertical-align:top"><p style="margin-left:21.3pt; text-indent:-21.3pt"><span style="width:21.3pt; text-indent:0pt; display:inline-block"></span><span>414</span></p></td><td style="width:331.2pt; padding-right:5.35pt; padding-left:5.35pt; vertical-align:top"><p><span>667, 414-0001 through 414-0099, 414-0151 through 414-0175,</span><br><span>414-0251 through 414-0280, 414-0351 through 414-0437,</span><br><span>414-0451 through 414-0550, 414-0601 through 414-0655,</span><br><span>414-0801 through 414-0855 and 414-0901 through 414-0965</span></p></td></tr></tbody></table>

	3. If the P/N is CM3589-50, 593-250-101, 593-250-102, W31-X2M5A-50 orW31-X1000-50 and the date code is earlier than 0434, the part has a safe life limit of 1,000 hours time in service (TIS) and must be replaced within the 1,000 hour time limit with a P/N CM3589-50 that has a date code of 0434 or later in accordance with the following:
	a. For Models 425 and 441 aeroplanes - SB CQB05-2, dated 21 February 2005 and the applicable maintenance manual.
	b. For all other affected aeroplane models - SB MEB05-1 dated21 February 2005 and the applicable maintenance manual.
	4. Avionics bus circuit breaker switches P/N CM3589-50, 593-250-101,593-250-102, W31-X2M5A-50 or W31-X1000-50 that do not have a date code or have a date code earlier than 0434 may not be installed as a replacement spare.
	Later revisions of the above SB(s), approved by the United States Federal Aviation Administration (FAA) as an Alternate Method of Compliance (AMOC) to FAA AD 2005-20-25, are considered acceptable for compliance with the equivalent Requirements of this Directive.
	Note: FAA AD 2005-20-25 Amdt 39-14321 refers.
Compliance:	For Requirement 1 - Within the next 200 hours TIS, the next 12 months or at the next scheduled inspection, after the effective date of this Directive, whichever occurs first.
	For Requirement 2 - Before further flight after the Requirement 1 inspection.
	For Requirement 3 - Within the 1,000-hour TIS safe life limit.
	For Requirement 4 - As of the effective date of this Directive.
	This Airworthiness Directive becomes effective on 22 December 2005.
Background:	The FAA has received failure reports of certain Tyco Electronics circuit breaker switches installed on the master avionics bus of Cessna Model 400 aeroplanes.
	Analysis of the circuit breaker switch revealed the copper braid inside the switch had frayed. Continued use causes an internal short. The internal short could result in the internal switch components or external wiring melting because it is no longer protected by the circuit breaker. The affected circuit breaker switches have a date code earlier than 0434 or do not have a date code on them. The date code consists of four digits, the first two represent the year and the last two represent the week of the year the part was made.

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