Airworthiness Directive · Amendment 39-23094 · Equipment/furnishings
The Boeing Company Airplanes
This AD applies to all The Boeing Company Model 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D, 747- 400F, 747-8F, and 747-8 series airplanes, certificated in any category.
The FAA is superseding Airworthiness Directive (AD) 2025-01- 08, which applied to all The Boeing Company Model 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D, 747-400F, 747-8F, and 747-8 series airplanes. AD 2025-01-08 required identifying the part number, and the serial number if applicable, of the Captain's and First Officer's seats and applicable on-condition actions for affected seats. AD 2025-01-08 also required a one-time detailed inspection and repetitive checks of the horizontal movement system (HMS) of the Captain's and First Officer's seats and applicable on-condition actions. Since the FAA issued AD 2025-01-08, the FAA determined that AD 2025-01-08 contains an error when providing conditions for taking credit using a previous revision of the service information. This AD requires the actions of AD 2025-01-08 and revises paragraph (j) of this AD to clarify which actions are not required. The FAA is issuing this AD to address the unsafe condition on these products.
Except as specified by paragraphs (i) and (j) of this AD: At the applicable times specified in the “Compliance” paragraph of Boeing Special Attention Service Bulletin 747-25-3644, Revision 2, dated January 27, 2023, do an inspection to determine the part number, and serial number as applicable, of the Captain's and First Officer's seats, and all applicable on-condition actions identified in, and in accordance with the Accomplishment Instructions of Boeing Special Attention Service Bulletin 747-25-3644, Revision 2, dated January 27, 2023. A review of airplane maintenance records is acceptable in lieu of this inspection if the part number and serial number of the Captain's and First Officer's seats can be conclusively determined from that review.
Except as specified by paragraphs (i) and (j) of this AD: At the applicable times specified in the “Compliance” paragraph of Boeing Special Attention Service Bulletin 747-25-3653, Revision 2, dated January 27, 2023, do all applicable actions identified as “RC” (required for compliance) in, and in accordance with, the Accomplishment Instructions of Boeing Special Attention Service Bulletin 747-25-3653, Revision 2, dated January 27, 2023. Actions identified as terminating action in Boeing Special Attention Service Bulletin 747-25-3653, Revision 2, dated January 27, 2023, terminate the applicable required actions of this AD, provided the terminating action is done in accordance with the Accomplishment Instructions of Boeing Special Attention Service Bulletin 747-25-3653, Revision 2, dated January 27, 2023.
(1) Where the “Compliance” paragraph of Boeing Special Attention Service Bulletin 747-25-3653, Revision 2, dated January 27, 2023, refers to the original issue date of this service bulletin, this AD requires using January 16, 2020 (the effective date of AD 2019-22-02, Amendment 39-19781 (84 FR 67854, December 12, 2019) (AD 2019-22-02), which was superseded by AD 2025-01-08).
(2) Where the “Compliance” paragraph of Boeing Special Attention Service Bulletin 747-25-3644, Revision 2, dated January 27, 2023, refers to 72 months after the original issue date of this service bulletin, this AD requires using 36 months after January 16, 2020 (the effective date of AD 2019-22-02).
(3) Where the “Compliance” paragraph of Boeing Special Attention Service Bulletin 747-25-3644, Revision 2, dated January 27, 2023, refers to the Revision 2 date of this service bulletin, this AD requires using the March 19, 2025 (the effective date of AD 2025-01-08).
If the airplane records show that an Ipeco Captain's or First Officer's seat installed on an airplane meets the conditions in any of the eleven rows for Boeing Special Attention Service Bulletin 747-25-3644, Revision 1, dated July 17, 20218, in Table 1 to paragraph (j) of this AD, then the actions in paragraph (g) of this AD are not required for that seat. If the airplane records show that an Ipeco Captain's or First Officer's seat meets the conditions in any of the three rows for Boeing Special Attention Service Bulletin 747-25-3653, Revision 1, dated October 19, 2018, in Table 1 to paragraph (j) of this AD, then the actions specified in paragraph (h) of this AD are not required for that seat.
| Actions done in accordance with Boeing Special Attention Service Bulletin— | Actions done in accordance with Ipeco Service Bulletin— | Having Ipeco P/N— | And additional required conditions— |
|---|---|---|---|
| 747-25-3644, Revision 1, dated July 17, 2018 | None | 3A258-0041-01-2 or 3A258-0042-01-2 | No additional conditions required. |
| 747-25-3644, Revision 1, dated July 17, 2018 | 097-25-02, Issue 1, dated October 2, 2013; or Issue 2, dated March 28, 2014; or Issue 3, dated March 4, 2020 | 3A090-0027-01-1 or 3A090-0028-01-1 | The manual override cable maintenance has been completed on the seat in accordance with the Ipeco Component Maintenance Manual 25-10-94, Revision 10, dated September 13, 2019, or subsequent revisions up to and including Revision 15, dated August 10, 2021. |
| 747-25-3644, Revision 1, dated July 17, 2018 | 107-25-03, Issue 1, dated October 2, 2013; or Issue 2, dated March 28, 2014; or Issue 3, dated March 4, 2020 | 3A090-0055-01-1 or 3A090-0056-01-1 | The manual override cable maintenance has been completed on the seat in accordance with the Ipeco Component Maintenance Manual 25-10-97, Revision 14, dated December 5, 2013, and subsequent revisions up to and including Revision 22, dated March 19, 2021. |
| 747-25-3644, Revision 1, dated July 17, 2018 | 112-25-02, Issue 1, dated November 4, 2013; or Issue 2, dated March 28, 2014; or Issue 3, dated March 18, 2020; or Issue 4, dated May 7, 2021 | 3A090-0065-01-1 or 3A090-0066-01-1 | The manual override cable maintenance has been completed on the seat in accordance with the Ipeco Component Maintenance Manual 25-11-01, Revision 9, dated September 20, 2013, and subsequent revisions up to and including Revision 18, dated December 19, 2021. |
| 747-25-3644, Revision 1, dated July 17, 2018 | 209-25-02, Issue 1, dated November 13, 2013; or Issue 2, dated March 28, 2014; or Issue 3, dated March 4, 2020 | 3A090-0075-01-1 or 3A090-0076-01-1 | The manual override cable maintenance has been completed on the seat in accordance with the Ipeco Component Maintenance Manual 25-11-32, Revision 4, dated September 27, 2013, and subsequent revisions up to and including Revision 9, dated July 23, 2020. |
| 747-25-3644, Revision 1, dated July 17, 2018 | 211-25-04, Issue 1, dated November 4, 2013; or Issue 2, dated March 28, 2014; or Issue 3, dated March 4, 2020 | 3A090-0079-01-1 or 3A090-0080-01-1 | The manual override cable maintenance has been completed on the seat in accordance with the Ipeco Component Maintenance Manual 25-10-79, Revision 23, dated September 5, 2013, and subsequent revisions up to and including Revision 31, dated July 23, 2020. |
| 747-25-3644, Revision 1, dated July 17, 2018 | 212-25-03, Issue 1, dated November 4, 2013; or Issue 2, dated March 28, 2014; or Issue 3, dated March 4, 2020 | 3A090-0081-01-1 or 3A090-0082-01-1 | The manual override cable maintenance has been completed on the seat in accordance with the Ipeco Component Maintenance Manual 25-10-80, Revision 9, dated September 27, 2013, and subsequent revisions up to and including Revision 15, dated July 23, 2020. |
| 747-25-3644, Revision 1, dated July 17, 2018 | 258-25-08, Issue 4, dated April 25, 2014; or Issue 5, dated March 4, 2020; or Issue 6, dated January 28, 2021 | 3A258-0041-01-1 or 3A258-0042-01-1 | Does not have a serial number identified by the effectivity of the referenced Ipeco Service Bulletins. |
| 747-25-3644, Revision 1, dated July 17, 2018 | 258-25-08, Issue 4, dated April 25, 2014; or Issue 5, dated March 4, 2020; or Issue 6, dated January 28, 2021 | 3A258-0041-01-1 or 3A258-0042-01-1 | The manual override cable maintenance has been completed on the seat in accordance with the Ipeco Component Maintenance Manual 25-11-38, Revision 21, dated December 12, 2013, or subsequent revisions up to and including Revision 53, dated December 4, 2023. |
| 747-25-3644, Revision 1, dated July 17, 2018 | 258-25-08, Issue 6, dated January 28, 2021 | 3A258-0041-01-1Z or 3A258-0042-01-1Z | Does not have a serial number identified by the effectivity of the referenced Ipeco Service Bulletin. |
| 747-25-3644, Revision 1, dated July 17, 2018 | 258-25-08, Issue 6, dated January 28, 2021 | 3A258-0041-01-1Z or 3A258-0042-01-1Z | The manual override cable maintenance has been completed on the seat in accordance with the Ipeco Component Maintenance Manual 25-11-38, Revision 21, dated December 12, 2013, or subsequent revisions up to and including Revision 53, dated December 4, 2023. |
| 747-25-3653, Revision 1, dated October 19, 2018 | None | 3A258-0041-01-2, 3A258-0041-01-1Z, 3A258-0042-01-2 or 3A258-0042-01-1Z | No additional conditions required. |
| 747-25-3653, Revision 1, dated October 19, 2018 | 258-25-13, Issue 3, dated November 27, 2017; or Issue 4, dated April 28, 2020, or Issue 5; dated November 1, 2021 | 3A258-0041-01-1 or 3A258-0042-01-1 | Has a horizontal actuator with Artus part number AD8650503 at “Amendment C” or later. |
| 747-25-3653, Revision 1, dated October 19, 2018 | 258-25-14, Issue 4, dated January 29, 2018; or Issue 5, dated April 28, 2020 | 3A258-0041-01-1 or 3A258-0042-01-1 | Has a horizontal actuator with Artus part number AD8650503 at “Amendment C” or later. |
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Aircraft
