AC 25-9A

Advisory circular · Smoke Detection, Penetration, and Evacuation Tests and Related Flight Manual Emergency Procedures

Approved
January 6, 1994
Last reviewed
January 30, 2020
Cancels
AC25-9
Family
AC 25-9 · 2 versions
Revision
A
14 CFR parts
25, 121
Cited by
1 AD

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

Show pages 12–23
Page 24OCROpen in PDF

Appendix 2

SELECTING NUMBER OF BOXES TO USE

(1) Crew rest areas utilizing ambient lonization-type smoke detection systems:

(a) For volumes up to 500 cubic feet use 2 burn boxes with a total of 3 paper towels (see description of operation step 4) 6 quarter sheets folded accordion style in each box. Light either simultaneously or sequenced up to 15 seconds apart.

(b) For volumes greater than 500 cubic feet: scale up fuel (paper towels) by adding 1.5 paper towels for each additional 150 cubic feet. Add Burn Boxes as required, to maintain control of the flame exiting the top of the Burn Box during testing.

(c) Crew rest areas enclosed with curtains, using Ionization type detectors.

(i) If designed with one detector in each bunk, use one burn box with one full sheet of paper towel.

(ii) If crew rest is designed to have one detector protect more than one bunk, use method described in (1) (a) or (b) above, depending on the volume enclosed.

(2) Standard Lavatory with ambient Ionization type detectors:

One Burn Box with 1 sheet of paper towel as fuel placed near the waste receptacle.

Page 25OCROpen in PDF

1/6/94 AC 25-9A Appendix 2 DOORS (Solid) HEAT RESISTANT MATERIAL (PAD) GLUED ON SHEET METAL

- HINGE 9°6

9.5' BOX CONSTRUCTED OF SHEET METAL RIVETTED ON ANGLE IRON FRAME INNER FRAME (Angle Irons)

BURN BOX SMOKE GENERATOR

OUTER BOX FIGURE 1 3

Page 26OCROpen in PDF

Appendix 2 AC 25-9A

DOOR WITH SCREEN HINGE

BURN BOX SMOKE GENERATOR - SCREEN FIGURE 2 INNER BOX (WHERE PAPER IS BURNED)

0.75" DIA HOLE (OPENING TO INSERT MATCH)

AIR INLET

4.0"x0.5" 4 SIDES

W/SCREEN

6.25"

6.25" FACING TOWARDS HEAT RESISTANT 1/6/94

SIDE DOOR MATERIAL (PAD)

ON OUTER BOX

Page 27OCROpen in PDF

1/6/94 BURN BOX SMOKE GENERATOR CLIP (4 PLACES)

TO SECURE INNER BOX FIGURE 3 PLAN VIEW HINGE - DOOR WITH SCREEN

- INNER BOX

OUTER BOX (TOP DOOR NOT SHOWN)

2.25"

HINGE -

SIDE DOOR

MAIA JOL Appendix 2 AC 25-9A

Page 28OCROpen in PDF

Appendix 1

PAPER TOWEL DIMENSIONS

TOP VIEW

FLAT LENGTH

END VIEW in .

~0.5"

BURN BOX SMOKE GENERATOR

FUEL (PAPER TOWEL) FIGURE 4 6