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AC 20-24D

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Advisory circular · Approval of Propulsion Fuels, Additives, and Lubricating Oils

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Approved
February 20, 2018
Last reviewed
March 9, 2018
This change
Update OPR (AIR-624)
Cancels
AC20-24C
Family
AC 20-24 · 3 versions
Revision
D
14 CFR parts
21, 23, 25, 27, 29, 33, 35
14 CFR sections
§ 21.8§ 23.1001§ 23.1011§ 23.1019§ 23.1041§ 23.1043§ 23.1045§ 23.1047§ 23.1123§ 23.1125§ 23.1301§ 23.1305§ 23.1337§ 23.1501§ 23.1521§ 23.1522§ 23.1527§ 23.1529§ 23.1541§ 23.1549§ 23.1557§ 23.1581§ 23.1583§ 23.1585§ 23.1587§ 23.23§ 23.25§ 23.29§ 23.343§ 23.53§ 23.601§ 23.603§ 23.63§ 23.65§ 23.69§ 23.77§ 23.863§ 23.901§ 23.903§ 23.905§ 23.909§ 23.939§ 23.943§ 23.951§ 23.954§ 23.955§ 23.959§ 23.961§ 23.963§ 23.965§ 23.967§ 23.969§ 23.973§ 23.975§ 23.979§ 23.993§ 23.997§ 25.1001§ 25.101§ 25.1011§ 25.1019§ 25.1041§ 25.1043§ 25.1045§ 25.105§ 25.107§ 25.109§ 25.1093§ 25.111§ 25.1123§ 25.1125§ 25.1127§ 25.113§ 25.115§ 25.117§ 25.119§ 25.121§ 25.123§ 25.1301§ 25.1305§ 25.1337§ 25.1351§ 25.1501§ 25.1521§ 25.1522§ 25.1527§ 25.1529§ 25.1533§ 25.1535§ 25.1541§ 25.1549§ 25.1553§ 25.1555§ 25.1557§ 25.1581§ 25.1583§ 25.1585§ 25.1587§ 25.21§ 25.23§ 25.25§ 25.27§ 25.29§ 25.603§ 25.833§ 25.863§ 25.901§ 25.903§ 25.905§ 25.907§ 25.939§ 25.943§ 25.945§ 25.951§ 25.952§ 25.955§ 25.959§ 25.961§ 25.963§ 25.967§ 25.969§ 25.973§ 25.975§ 25.979§ 25.981§ 25.997§ 27.1011§ 27.1019§ 27.1041§ 27.1043§ 27.1045§ 27.1305§ 27.1337§ 27.1521§ 27.1529§ 27.1541§ 27.1555§ 27.1581§ 27.1583§ 27.1585§ 27.25§ 27.27§ 27.29§ 27.45§ 27.49§ 27.51§ 27.603§ 27.65§ 27.67§ 27.75§ 27.863§ 27.903§ 27.923§ 27.927§ 27.939§ 27.951§ 27.955§ 27.959§ 27.961§ 27.969§ 27.975§ 27.997§ 29.1001§ 29.1011§ 29.1019§ 29.1041§ 29.1043§ 29.1045§ 29.1047§ 29.1049§ 29.1305§ 29.1337§ 29.1521§ 29.1522§ 29.1529§ 29.1541§ 29.1557§ 29.1581§ 29.1583§ 29.1585§ 29.1587§ 29.25§ 29.27§ 29.29§ 29.45§ 29.49§ 29.51§ 29.53§ 29.603§ 29.63§ 29.65§ 29.67§ 29.77§ 29.79§ 29.83§ 29.85§ 29.863§ 29.901§ 29.903§ 29.923§ 29.927§ 29.939§ 29.951§ 29.955§ 29.959§ 29.961§ 29.969§ 29.975§ 29.979§ 29.997§ 33.15§ 33.17§ 33.19§ 33.21§ 33.28§ 33.35§ 33.39§ 33.4§ 33.42§ 33.43§ 33.45§ 33.47§ 33.49§ 33.5§ 33.51§ 33.53§ 33.55§ 33.57§ 33.65§ 33.67§ 33.7§ 33.71§ 33.72§ 33.73§ 33.82§ 33.85§ 33.87§ 33.89§ 33.91§ 33.93§ 33.99

Guidance, not mandatory unless a rule or AD requires it. DRS record last changed October 23, 2026.

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Page 37Open in PDF

Appendix 3 A3-7

c. Normal Category Rotorcraft. (Additional requirements from appendix A to part 27 may apply for Category A approval of rotorcraft.)

§ 27.863(b)(2) Flammable fluid fire protection § 27.903 Engines § 27.923 Rotor drive system and control mechanism tests § 27.927 Additional tests § 27.1011(b) General (oil system) § 27.1019 Oil strainer or filter § 27.1041 General (cooling) § 27.1043 Cooling tests § 27.1045 Cooling test procedures § 27.1521 Powerplant limitations § 271529 Instructions for Continued Airworthiness § 27.1541 General (markings and placards) § 27.1581 General (airplane flight manual) § 27.1583 Operating limitations

d. Transport Category Rotorcraft.

§ 29.863(b)(2) Flammable fluid fire protection § 29.903 Engines § 29.901(c)(d) Auxiliary power unit § 29.923 Rotor drive system and control mechanism tests § 29.927 Additional tests § 29.1011(b) General (oil system) § 29.1019 Oil strainer or filter § 29.1041 General (cooling) § 29.1043 Cooling tests § 29.1045 Climb cooling test procedures § 29.1047 Takeoff cooling test procedures § 29.1049 Hover cooling test procedures § 29.1521 Powerplant limitations § 29.1522 Auxiliary power unit limitations § 29.1529 Instructions for Continued Airworthiness § 29.1541 General (markings and placards) § 29.1581 General (airplane flight manual) § 29.1583 Operating limitations

Page 38Open in PDF

Appendix 4

Appendix 4 Advisory Circular Feedback Form If you find an error in this AC, have recommendations for improving it, or have suggestions for new items/subjects to be added, you may let us know by (1) emailing this form to 9-AWA- AVS-AIR-DMO@faa.gov or (2) faxing it to (202) 267-1813.

Subject: AC 21-29D change 1 Date: ____________________ Please check all appropriate line items:

 An error (procedural or typographical) has been noted in paragraph __________________ on page __________________________.

 Recommend paragraph ____________ on page ______________ be changed as follows:

 In a future change to this AC, please cover the following subject:

(Briefly describe what you want added.)

 Other comments:

 I would like to discuss the above. Please contact me.

Submitted by: __________________________________ Date: ________________________