---
kind: "section"
citation: "14 C.F.R. § 26.45"
title: "14"
number: "26.45"
heading: "Holders of type certificates—Alterations and repairs to alterations."
url: "https://uscodex.org/cfr/14/26.45"
---

# §26.45. Holders of type certificates—Alterations and repairs to alterations.

- (a) **Applicability.** This section applies to transport category airplanes subject to [§ 26.43](/cfr/14/26.43.md).
- (b) **Fatigue critical alteration structure.** For existing and future alteration data developed by the holder of a type certificate, the holder must—
  - (1) Review alteration data and identify all alterations that affect fatigue critical baseline structure identified under [§ 26.43(b)(1)](/cfr/14/26.43.md?p=b-1);
  - (2) For each alteration identified under [paragraph (b)(1)](#b-1) of this section, identify any fatigue critical alteration structure;
  - (3) Develop and submit to the responsible Aircraft Certification Service office for review and approval a list of the structure identified under [paragraph (b)(2)](#b-2) of this section; and
  - (4) Upon approval, make the list required in [paragraph (b)(3)](#b-3) of this section available to persons required to comply with §§ [121.1109](/cfr/14/121.1109.md) and [129.109](/cfr/14/129.109.md) of this chapter.
- (c) **DT Data.** For existing and future alteration data developed by the holder of a type certificate that affect fatigue critical baseline structure identified under [§ 26.43(b)(1)](/cfr/14/26.43.md?p=b-1), unless previously accomplished, the holder must—
  - (1) Perform a DTE and develop the DTI for the alteration and fatigue critical baseline structure that is affected by the alteration;
  - (2) Submit the DT data developed in accordance with [paragraphs (c)(1)](#c-1) of this section to the responsible Aircraft Certification Service office or its properly authorized designees for review and approval; and
  - (3) Upon approval, make the DTI available to persons required to comply with §§ [121.1109](/cfr/14/121.1109.md) and [129.109](/cfr/14/129.109.md) of this chapter.
- (d) **DT Data for Repairs Made to Alterations.** For existing and future repair data developed by a holder of a type certificate, the type certificate holder must—
  - (1) Review the repair data, and identify each repair that affects any fatigue critical alteration structure identified under [paragraph (b)(2)](#b-2) of this section;
  - (2) For each repair identified under [paragraph (d)(1)](#d-1) of this section, unless previously accomplished, perform a DTE and develop DTI;
  - (3) Submit the DT data developed in accordance with [paragraph (d)(2)](#d-2) of this section to the responsible Aircraft Certification Service office or its properly authorized designees for review and approval; and
  - (4) Upon approval, make the DTI available to persons required to comply with §§ [121.1109](/cfr/14/121.1109.md) and [129.109](/cfr/14/129.109.md) of this chapter.
- (e) **Compliance times.** Holders of type certificates must submit the following to the responsible Aircraft Certification Service office or its properly authorized designees for review and approval by the specified compliance time:
  - (1) The list of fatigue critical alteration structure identified under [paragraph (b)(3)](#b-3) of this section must be submitted—
    - (i) **No later than 360 days after January 11, 2008, for alteration data approved before January 11, 2008.**
    - (ii) No later than 30 days after March 12, 2010 or before initial approval of the alteration data, whichever occurs later, for alteration data approved on or after January 11, 2008.
  - (2) For alteration data developed and approved before January 11, 2008, the DT data required by [paragraph (c)(2)](#c-2) of this section must be submitted by June 30, 2009.
  - (3) For alteration data approved on or after January 11, 2008, DT data required by [paragraph (c)(2)](#c-2) of this section must be submitted before initial approval of the alteration data.
  - (4) For repair data developed and approved before January 11, 2008, the DT data required by [paragraph (d)(2)](#d-2) of this section must be submitted by June 30, 2009.
  - (5) For repair data developed and approved after January 11, 2008, the DT data required by [paragraph (d)(2)](#d-2) of this section must be submitted within 12 months after initial approval of the repair data and before making the DT data available to persons required to comply with §§ [121.1109](/cfr/14/121.1109.md) and [129.109](/cfr/14/129.109.md) of this chapter.

## Notes

### Amendments

[Doc. No. FAA-2005-21693, 72 FR 70505, Dec. 12, 2007, as amended by Amdt. 26-4, 75 FR 11734, Mar. 12, 2010; Doc. No. FAA-2018-0119, Amdt. 26-7, 83 FR 9170, Mar. 5, 2018]

### Source

Source: Docket No. FAA-2005-21693, 72 FR 70505, Dec. 12, 2007, unless otherwise noted.

### Authority

Authority: 49 U.S.C. 106(g), 40113, 44701, 44702 and 44704.

### Source

Source: Docket No. FAA-2004-18379, 72 FR 63409, Nov. 8, 2007, unless otherwise noted.

### Amendments

[Doc. No. FAA-2005-21693, 72 FR 70505, Dec. 12, 2007, as amended by Amdt. 26-4, 75 FR 11734, Mar. 12, 2010; Doc. No. FAA-2018-0119, Amdt. 26-7, 83 FR 9170, Mar. 5, 2018]