AC 20-100

Advisory circular · General Guidelines for Measuring Fire-Extinguishing Agent Concentrations in Powerplant Compartments

Approved
September 21, 1977
Last reviewed
January 13, 2017
Family
AC 20-100 · 1 version
14 CFR parts
21, 25, 29
14 CFR sections
§ 21.21§ 25.1195

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

Show pages 1–12
Page 13 · 4OCROpen in PDF

AC No. 20-100 9/21/77 Appendix 1 Figure 4. Typical Three-Ring Sampling Probe Positioning Page 4

Page 14OCROpen in PDF

9/21/77 PAPER SPEED: 1.5 INCHES PER SECOND 1.0 Г

AGENT CONTAINER DISCHARGE AGENT CONTAINER, 1995 INDICATOR TRACE DISCHARGED мини INITIAL INDICATION OF EXTINGUISHING AGENT AT PROBE NO. 12 (AD-MD

DEFLECTION (AD) = 3.08"" TIMING SIGNAL: 2 PULSES

- VACUUM PUMP *ON" PER SECOND

STATIC REFERENCE TRACES BASE LINE PICKUP NO. 9 Page 5 Figure 5. Typical Flight Test Oscillograph Record Appendix 1 AC No. 20-100

Page 15OCROpen in PDF

Page 6 Appendix 1 AC No. 20-100 AMBIENT TEMPERATURES (°C) -50 -20 - 10 10 20 30 40 80 90

1.00

1.01

HUMIDITY 100 PERCENT

1.02 80 PERCENT 60 PERCENT

1.05 40 PERCENT

1.07 20 PERCENT

1.08. 9/21/77 Figure 6. Humidity Correction Factors

Page 16OCROpen in PDF

Appendix 1 120 100- (PERCENT RELATIVE CONCENTRATION) 80 -

RECORDER INDICATION VOLUME PERCENTAGE 60-

WEIGHT PERCENTAGE 40 20- 20 40 60 80 100 120

CONCENTRATION (PERCENTAGE) Figure 7. Curve for Converting Relative Concentration to Volume and Weight Percentages of Carbon Dioxide in Air Page 7

Page 17OCROpen in PDF

AC No. 20-100 9/21/77 Appendix 1 120 100

RECORDER INDICATION (PERCENT RELATIVE CONCENTRATION) VOLUME PERCENTAGE

WEIGHT PERCENTAGE 20 40 60 80 100 120

CONCENTRATION (PERCENTAGE) Figure 8. Curve for Converting Relative Concentration to Volume and Weight Percentages of Methyl Bromide in Air Page 8

Page 18OCROpen in PDF

LL/IZ/6

RECORDER INDICATION (PERCENT RELATIVE CONCENTRATION) VOLUME PERCENTAGE WEIGHT PERCENTAGE 5 10 15 20 25 30 35 40 6 эдв¿ CONCENTRATION (PERCENTAGE) Appendix 1 Figure 9. Curve for Converting Relative Concentration to Volume and Weight AC No. 20-100 Percentage of Bromochloromethane in Air

Page 19OCROpen in PDF

AC No. 20-100 9/21/77 Appendix 1 120 100 (PERCENT RELATIVE CONCENTRATION) VOLUME PERCENTAGE

RECORDER INDICATION WEIGHT PERCENTAGE 20 40 80 100 120

CONCENTRATION (PERCENTAGE) Figure 10. Curve for Converting Relative Concentration to Volume and Weight Percentages of Dibromodifluoromethane Page 10

Page 20OCROpen in PDF

Appendix 1 120 100-

RECORDER INDICATION (PERCENT RELATIVE CONCENTRATION)

WEIGHT PERCENTAGE 60 80 100 120

CONCENTRATION (PERCENTAGE) Figure 11. Curve for Converting Relative Concentration to Volume and Weight Percentages of Bromotrifluoromethane in Air # U. 8. COVERNMENT PRENTING OFFICE: 1877 731-174/51 Page 11