Hydraulic Power

Draft · under review

This draft is for study only; it is not a maintenance document. Sources: FAA AD 2020-02-22 (85 FR 8148, 13 Feb 2020) and FAA AD 2022-01-08 (87 FR 5389, 1 Feb 2022), both downloaded from govinfo.gov on 2026-11-10 and read as literal Federal Register text (page numbers are Federal Register pages); EASA TCDS EASA.A.172 Issue 08 (1 Feb 2026), pp.29 and 63 rendered and read by eye (page numbers are the printed "Page N of 68"); FAA JASC code table (grouping and code descriptions only; printed page = PDF page minus 7, both given). Model names are given as each source prints them; nothing said about one model is extended to the family. The heading "29-00" is this site's grouping, following FAA JASC chapter 29 "Hydraulic Power" with code 2900 "Hydraulic Power System"; neither AD prints a "29-xx" sub-section numbering. The only ATA statement the two ADs print is their "Subject" paragraph (d): "Air Transport Association (ATA) of America Code 29, Hydraulic power." No licensed manual and no Airbus AC page was used. The ADs are described only as to what they address; this draft gives no compliance times and no inspection procedures. Where an AD reports EASA text, the bullet says so. The names of the A300's hydraulic systems, their number, their pumps and the actuators they serve are not given because no page read here prints them.

A300 and A300-600 models named per source · FAA Airworthiness Directives and EASA TCDS

29-00 Hydraulic power: general

The FAA JASC table describes code 2900 as the units and components that furnish hydraulic fluid under pressure to a common point (manifold) for re-distribution to other defined systems, for miscellaneous system parts other than components listed under other specific JASC Chapter 29 codes, and for reports of units or parts common to two or more components. It is an FAA code table, not a description of the A300.^[1]
JASC lists under chapter 29, among others: 2910 Hydraulic System, Main; 2911 Hydraulic Power Accumulator, Main; 2912 Hydraulic Filter, Main; 2913 Hydraulic Pump (Electric/Engine), Main; 2915 Hydraulic Pressure Relief Valve, Main; 2916 Hydraulic Reservoir, Main; 2920 Hydraulic System, Auxiliary; 2930 Hydraulic Indicating System; 2997 Hydraulic Power System Wiring. JASC describes 2916 as "the component which stores hydraulic fluid".^[1][1]
The two ADs below each give their subject as "Air Transport Association (ATA) of America Code 29, Hydraulic power.".^[2][3]

29-00 Hydraulic fluid specification (TCDS)

For the section of TCDS EASA.A.172 headed "A300B4-600, A300C4-600, A300B4-600R, A300F4-600 R and A300C4-600R SERIES - ALL MODELS" (section 20), item 20.5 "Hydraulic fluids" prints: "NSA specification 30.7110.".^[4]
For the section headed "A300 ALL SERIES ALL MODELS (EXCEPT A300 B4-600, A300 C4-600, A300 B4-600R, A300 F4-600R AND A300 C4-600R SERIES)" (section 10), item 10.5 "Hydraulic fluids" prints: "Specification NSA 30-7110". On the rendered page 29 this text is struck through and the page carries a "SURRENDERED" stamp.^[4]
The two items print the specification number differently ("30.7110" in section 20, "30-7110" in section 10); this draft reports both as printed and does not decide whether they are the same designation. The TCDS items give no fluid trade name or type.^[4][4]

29-00 Reservoir air pressurization lines (AD 2020-02-22)

Applicability: Paragraph (c), as printed: "This AD applies to all Airbus SAS Model airplanes specified in paragraphs (c)(1) through (5) of this AD, certificated in any category." The listed models are Model A300 B4-601, B4-603, B4-620, and B4-622; Model A300 B4-605R and B4-622R; Model A300 F4-605R and F4-622R; Model A300 C4-605R Variant F; and Model A310-203, -204, -221, -222, -304, -322, -324, and -325 airplanes.^[2]
Applicability: The AD's summary describes its scope as "all Airbus SAS Model A300 B4-600, B4-600R, and F4-600R series airplanes, and Model A300 C4-605R Variant F airplanes (collectively called Model A300-600 series airplanes); and Model A310 series airplanes".^[2]
Applicability: The AD reports that EASA AD 2019-0188 (dated July 31, 2019) concerns "all Airbus SAS Model A300-600 series airplanes; Model A310 series airplanes; and Model A300F4-608ST airplanes"; the FAA states that Model A300F4-608ST airplanes are not certified by the FAA and are not on the U.S. type certificate data sheet, so the AD does not include them.^[2]
What the AD addresses: Paragraph (e): "This AD was prompted by a determination that new tests are necessary to address potential air leaks in the reservoir air pressurization lines. The FAA is issuing this AD to address air leaks that could result in the loss of a hydraulic system and consequent reduced controllability of the airplane.".^[2]
What the AD addresses: The summary describes the requirement as repetitive pressurization tests of the reservoir air pressurization lines for pipe rupture and leaks, and repair or replacement if necessary, as specified in EASA AD 2019-0188, which the AD incorporates by reference.^[2][2]
What the AD addresses: The AD's description of EASA AD 2019-0188 says it "describes airworthiness limitations involving repetitive pressurization tests of the reservoir air pressurization lines for pipe rupture and leaks, and repair and replacement of affected hydraulic pipes, ducts, and pressurization lines".^[2]
What the AD addresses: The FAA states that it considers this AD interim action.^[2]
What the AD addresses: The AD's only commenter, ALPA, stated that it supports the NPRM.^[2]

29-00 Fire shut-off valves (FSOV) actuator (AD 2022-01-08, coded ATA 29 by the AD)

The AD codes this subject as ATA 29, Hydraulic power. This draft does not explain what an FSOV is or how it relates to the hydraulic system, because no page read here does.^[3]
Applicability: Paragraph (c), as printed: "This AD applies to all Airbus SAS airplanes identified in paragraphs (c)(1) through (6) of this AD, certificated in any category." The listed models are Model A300 B2-1A, B2-1C, B2K-3C, B2-203, B4-2C, B4-103, and B4-203; Model A300 B4-601, B4-603, B4-620, and B4-622; Model A300 B4-605R and B4-622R; Model A300 C4-605R Variant F; Model A300 F4-605R and F4-622R; and Model A310-203, -204, -221, -222, -304, -322, -324, and -325 airplanes.^[3]
Applicability: The AD's summary describes its scope as "all Airbus SAS Model A300 series airplanes; Airbus SAS Model A300 B4-600, B4-600R, and F4-600R series airplanes, and Model A300 C4-605R Variant F airplanes (collectively called Model A300-600 series airplanes); and Airbus SAS Model A310 series airplanes" (the summary's wording differs from the model list in paragraph (c); both are given as printed).^[3][3]
Applicability: The AD reports that EASA AD 2021-0106 (dated April 15, 2021) concerns "all Airbus SAS Model A300, A310, and A300-600 series airplanes, and A300-600ST airplanes"; the FAA states that Model A300-600ST airplanes are not certificated by the FAA and are not on the U.S. type certificate data sheet, so the AD does not include them.^[3]
What the AD addresses: The AD "was prompted by reports of incorrect installation of the fire shut-off valves (FSOV) actuator, which was found to rotate around its pivot axis".^[3][3]
What the AD addresses: Paragraph (e) says the FAA issued the AD "to address incorrect installation of the FSOV actuator", a condition that, "if not addressed, could lead to FSOV failure, and consequent risk of a temporary uncontrolled engine fire, possibly resulting in damage to, and reduced control of, the airplane".^[3]
What the AD addresses: The summary describes the requirement as a one-time detailed inspection of the FSOV actuator for rotation around its pivot axis, and replacement if necessary, as specified in EASA AD 2021-0106, which the AD incorporates by reference.^[3][3]
What the AD addresses: The AD's description of EASA AD 2021-0106 says it "describes procedures for a one-time detailed inspection of the FSOV actuator for rotation around its pivot axis, and replacement" and also "describes procedures for reporting inspection results to Airbus".^[3]
What the AD addresses: Paragraph (h)(4) says that where the service information referenced in EASA AD 2021-0106 specifies to send the FSOV actuator for repair if it moves (rotates around its pivot axis) during the inspection, this AD requires replacing any FSOV actuator that moves (rotates around its pivot axis) during the inspection with a serviceable actuator, as specified in EASA AD 2021-0106.^[3]
What the AD addresses: The AD's cost section refers to on-condition action "required based on the results of any required actions" and includes a parts cost; the AD's text read here does not state what the part is.^[3]
What the AD addresses: The AD's only commenter, ALPA, supported the NPRM without change.^[3]

Not yet covered

System names (the colour or other names of the hydraulic systems), their number, the pumps, reservoirs, accumulators, actuators served, pressures and the fluid trade name or type for the A300: no source read in this task prints them. The Airbus AC, NTSB/AAR-04/04 and licensed manuals were not opened here. Whether TCDS "NSA specification 30.7110" (section 20) and "Specification NSA 30-7110" (section 10, SURRENDERED page) are the same designation, and what the specification covers, is not stated by the TCDS. EASA AD 2019-0188 and EASA AD 2021-0106 (the documents the two FAA ADs incorporate) were not read; what they say beyond the FAA's description is unknown here. No download was attempted from ad.easa.europa.eu, because earlier A300 tasks recorded that site returning a maintenance page on 2026-11-10. Which pipes, ducts and pressurization lines are meant by "reservoir air pressurization lines", which reservoirs they serve, and which hydraulic system the "loss of a hydraulic system" refers to are not stated in the AD text. What an FSOV is in the A300 architecture (which fire shut-off valves, what they shut off, why an AD coded 29 concerns it) is not stated in the AD text read; its ATA 29 coding is the AD's own. Other ATA 29 ADs for the A300-600 were not searched for; this draft covers only the two ADs the survey lists as ATA 29. The survey's ATA 29 row also cites FAA AD 2018-19-07, which its AD list codes ATA 32 and which was not opened for this draft.

Kaynaklar

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FAA Joint Aircraft System/Component (JASC) Code Table and Definitions, Information last updated October 27, 2008 (2008-10-27) — p.21-22 (PDF pp.28-29); p.22 (PDF p.29); p.23 (PDF p.30). https://www.faa.gov/sites/faa.gov/files/JASC_Code.pdf · erişim 2026-11-10
FAA AD 2020-02-22 — Airbus SAS airplanes (A300-600 included), Issue 85 FR 8148 (2020-02-13) — para (d) p.8149; para (c) p.8149; Summary p.8148; Discussion p.8148; para (e) p.8149; para (g) p.8149; Related IBR Material p.8148; Interim Action p.8148; Comments p.8148. https://www.govinfo.gov/content/pkg/FR-2020-02-13/html/2020-02864.htm · erişim 2026-11-10
FAA AD 2022-01-08 — Airbus SAS airplanes (A300-600 included), Issue 87 FR 5389 (2022-02-01) — para (d) p.5390; para (c) p.5390; Summary p.5389; Background p.5389; para (e) pp.5390-5391; para (g) p.5391; Related Service Information p.5389; para (h)(4) p.5391; Costs of Compliance p.5390; Comments p.5389. https://www.govinfo.gov/content/pkg/FR-2022-02-01/html/2022-01961.htm · erişim 2026-11-10
EASA TCDS EASA.A.172 — Airbus A300, A310, A300-600, Issue 08 (2026-02-01) — §20.5 p.63; §10.5 p.29. https://www.easa.europa.eu/en/downloads/17110/en · erişim 2026-11-10

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