Airborne Auxiliary Power

Draft · under review

This draft is for study only; it is not a maintenance document. Sources: EASA TCDS EASA.A.172 Issue 08 (1 Feb 2026; pp.29 and 62 rendered and read visually, because `pdftotext -layout` shifts table rows in this TCDS; pp.26, 56, 63 headings and text only), Airbus AC A300-600 "Airplane Characteristics for Airport Planning" Revision 13, Dec 2009 (PDF pp.77, 78, 134 are image pages, rendered and read visually; PDF p.134 also at 2.6x), FAA JASC code table (grouping and code description only). Page numbers are PDF page numbers; for A.172 they equal the printed "Page n of 68". Model and APU names are given as printed, units as printed, not converted. The heading "49-00" is this site's grouping, following FAA JASC code 4900 "Airborne Auxiliary Power Unit (APU) System"; neither A.172 nor the AC pages read print a "49-xx" sub-section numbering for these items (A.172 prints 49 numbers here only in the service bulletin number SB A300-49-6007, §20.3 p.62, and in the struck-through manual reference "TSCP700 49.20.00 table 303", §10.3 p.29). No AD, NTSB report or licensed manual was used.

A300 B-series and A300-600 APU · EASA TCDS and Airbus AC

49-00 Airborne auxiliary power: general

The FAA JASC table describes code 4900 as the airborne auxiliary power units installed on aircraft for generating and supplying a single type or combination of auxiliary electric, hydraulic, pneumatic or other power; it states that the code does not include "generators, alternators, hydraulic pumps, etc., or their connecting systems which supply and deliver power to their respective aircraft systems". It is an FAA code table, not a description of the A300.^[1]

49-00 APU model per A300 model and limitations (A.172)

A300-600 series (A.172 §20.3, p.62): §20 applies to "A300B4-600, A300C4-600, A300B4-600R, A300F4-600 R and A300C4-600R SERIES - ALL MODELS".^[2]
A300-600 series (A.172 §20.3, p.62): Honeywell (formerly AIRESEARCH) GTCP 331-250 (F) (Specification 31-2891) is listed as printed "for models A300 B4-620 /-601 & -622 and A300 C4-620".^[2]
A300-600 series (A.172 §20.3, p.62): Honeywell (formerly AIRESEARCH) GTCP 331 - 250 (H) is listed as printed "for A300 B4-603/B4-605R/ B4-622R/F4-605R and A300F4-622R and for models A300 B4-601/-620/-622 and A300 C4-620 after incorporation of modification 8409 (SB A300-49-6007)".^[2]
A300-600 series (A.172 §20.3, p.62): Limitations table, rendered and read (one table, printed once after both APU entries, not split per APU type): available mechanical shaft power at sea level 98.5 kW; maximum operating speed 43 562 rpm; maximum gas temperature at turbine outlet 585° C.^[2]
A300-600 series (A.172 §20.3, p.62): Approved oils: the page refers to "Maintenance Honeywell (formerly AIRESEARCH) GTCP 331 – 250" (printed so; no oil name or specification is given in the TCDS).^[2]
A300-600 series (A.172 §20.3, p.62): Fuel: A.172 states that the fuels listed (JET A, JET A1, JET B, JP4, JP5, JP8, N°3-JET, TS-1 and RT) "are also suitable for the APU" for the A300-600 series; the CML is referred to for fuel specifications.^[2]
A300 models of §10, not the -600 series (A.172 §10.3, marked SURRENDERED): §10 covers "A300 ALL SERIES ALL MODELS (EXCEPT A300 B4-600, A300 C4-600, A300 B4-600R, A300 F4-600R AND A300 C4-600R SERIES)".^[2]
A300 models of §10, not the -600 series (A.172 §10.3, marked SURRENDERED): On the rendered page the whole of §10.3 carries the SURRENDERED stamp and struck-through text, so it is history only.^[2]
A300 models of §10, not the -600 series (A.172 §10.3, marked SURRENDERED): Printed (struck through): Honeywell (formerly AIRESEARCH) TSCP 700-5 (Specification SC 6203), operating limitations: available mechanical shaft power at sea level 105.8 KW; maximum operating speed N1 30 910 rpm - 110 %, N2 38 845 rpm - 110 %; maximum gas temperature at turbine 585° C.^[2]
A300 models of §10, not the -600 series (A.172 §10.3, marked SURRENDERED): Printed (struck through): approved oils "See Honeywell (formerly AIRESEARCH) maintenance manual TSCP700 49.20.00 table 303"; §10.4 states the listed fuels (JET A, JET A1, JET B, JP4, JP5, JP8, N°3-JET) are also suitable for the APU.^[2][2]
A300 models of §10, not the -600 series (A.172 §10.3, marked SURRENDERED): The §10.3 text does not say which of the §10 models carry the TSCP 700-5; it is printed once under §10, not per model.^[2]

49-00 APU in the AC (ground service point and exhaust)

Ground service connection N (AC 5.4): The AC 5.4.1 symbol list (MODEL A300-600, Feb 28/83) includes letter N with the text "APU OIL FILLING".^[3]
Ground service connection N (AC 5.4): The AC 5.4.2 ground service connections drawing (MODEL A300-600, Feb 29/84) shows a marked point N in the side view, drawn within the rear fuselage outline near the tail end, aft of the point marked E; its leader line runs down to the letter N below the aircraft. The plan view on the same page has no N point. The drawing shows no APU itself, and the page does not state where the APU is installed.^[3]
Exhaust gas temperature and velocity decay (AC 6.3.4): Chapter 6.3.4 page 1 (Oct 30/94) is captioned "APU - Exhaust Gas Temperature & Velocity DECAY - APU" under the heading A300-600; two drawings show the rear fuselage and tail in side view with contour lines.^[3]
Exhaust gas temperature and velocity decay (AC 6.3.4): Upper drawing, temperature contour labels as printed: 315,5°C (600°F), 260°C (500°F), 204°C (400°F), 177°C (350°F), 149°C (300°F), 121°C (250°F), 93°C (200°F).^[3]
Exhaust gas temperature and velocity decay (AC 6.3.4): Lower drawing, velocity contour labels as printed: 76m/s (250ft/s), 61m/s (200ft/s), 46m/s (150ft/s), 30,5m/s (100ft/s), 24m/s (80ft/s), 18m/s (60ft/s), 15m/s (50ft/s).^[3]
Exhaust gas temperature and velocity decay (AC 6.3.4): Scales as printed: horizontal axis (m) 0, 5, 10, 15 with (FEET) 0, 16.404, 32.808, 49.212; vertical axis (m) 0, 5, 10 with (FEET) 0, 16.404, 32.808. The labels "FD" and "CL" appear on the drawings and are not explained on the page.^[3]
Exhaust gas temperature and velocity decay (AC 6.3.4): The page prints no APU model, no operating condition (load, wind, ambient temperature) and no statement of the distance at which each contour ends; contour lengths were not read from the drawings.^[3]

Not yet covered

A.172 §20.3 names no APU for A300 C4-605 R Variant F (§19); the (F) list names only B4-620/-601/-622 and C4-620, and whether C4-605R falls under (H) is not printed. A.172 gives one limitations table for both GTCP 331-250 (F) and (H); whether the values differ per variant is not stated. APU location, dimensions, mounting, doors, air intake, bleed, starting, controls, fire protection: no public Level 1 source read here describes them (the AC pages read, PDF pp.77, 78 and 134, do not draw or locate the APU; AMM, IPC and FCOM are licensed and not used). The AC 6.3.4 drawing and AC 5.4 point N print no APU model. A.172 §20.3 lists GTCP 331-250 (F) and (H) for named models of the A300-600 series; the surrendered TSCP 700-5 entry (§10.3) is outside that series. Which of (F) or (H), if either, the AC pages refer to is not printed; no mapping is made. Whether modification 8409 / SB A300-49-6007 is incorporated on a given aircraft is not stated in any source read. A.172 refers for approved oils to "Maintenance Honeywell (formerly AIRESEARCH) GTCP 331 – 250" (§20.3) and, in the struck-through §10.3, to a Honeywell maintenance manual; neither was read.

Kaynaklar

Bu sayfadaki her bilgi herkese açık bir kaynağa bağlıdır. Erişim tarihleri belge başına gösterilir.

FAA Joint Aircraft System/Component (JASC) Code Table and Definitions, Information last updated October 27, 2008 (2008-10-27) — p.36 (PDF p.43). https://www.faa.gov/sites/faa.gov/files/JASC_Code.pdf · erişim 2026-11-10
EASA TCDS EASA.A.172 — Airbus A300, A310, A300-600, Issue 08 (2026-02-01) — §20 p.56; §20.3 p.62; §20.4 p.63; §10 heading p.26; §10.3 p.29; §10.4 p.29. https://www.easa.europa.eu/en/downloads/17110/en · erişim 2026-11-10
Airbus AC A300-600 — Aircraft Characteristics, Airport and Maintenance Planning, Revision 13 (2009-12-01) — §5.4.1 p.1 (PDF p.77); §5.4.2 p.2 (PDF p.78); §6.3.4 p.1 (PDF p.134). https://www.aircraft.airbus.com/sites/default/files/2023-02/Airbus-Commercial-Aircraft-AC-A300-600-Dec-2009.pdf · erişim 2026-11-10

← Önceki bölüm · ATA 32 Sonraki bölüm · ATA 52 →