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Jet A-1

Jet A-1 is the most widespread type of jet fuel globally for use in turbofan- and turboprop-powered commercial aircraft. Jet A-1 from Mabanaft meets the AFQRJOS Check List (Latest Issue attached below) which embodies the requirements of the two main specifications Def Stan 91-091 (Issue 11) and ASTM D1655 (Latest Issue). It also meets the NATO F-35 specification.

JOINT FUELLING SYSTEM CHECK LIST FOR JET A-1

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TEST METHOD
Property Limits IP ASTM Remarks
APPEARANCE
Visual appearance Clear, bright and visually free from solid matter and un-dissolved water at ambient fuel temperature
Colour Report D 156 or D 6045 See Note 1
Particulate contamination mg/L Max 1.0 423 D 5452 See Note 2
Particulate, cumulative channel particle counts, ISO Code & Individual Channel Counts 564 or 565 or 577 See Note 3
≥ 4 μm(c) Report
≥ 6 μm(c) Report
≥ 14 μm(c) Report
≥ 21 μm(c) Report
≥ 25 μm(c) Report
≥ 30 μm(c) Report
COMPOSITION See Note 4, 5
Total Acidity, mg KOH/g Max 0.015 354 D 3242
Aromatics, % v/v. Max 25.0 156 D 1319
OR Total Aromatics, % v/v Max 26.5 436 D 6379 See Note 6
Sulphur, Total, % m/m Max 0.30 336 D 1266 or D 2622 or D 4294 or D 5453
Sulphur, Mercaptan, % m/m Max 0.0030 342 D 3227
OR Doctor Test Negative 30 D 4952 See Note 7
Refinery Components at point of manufacture: See Note 8
Non Hydroprocessed Components, %v/v Report (incl. 'nil' or '100%’)
Mildly Hydroprocessed Components, % v/v Report (incl. 'nil' or '100%’)
Severely Hydroprocessed Components, % v/v Report (incl. 'nil' or '100%’)
Synthetic Components, %v/v Report (incl. ‘nil’ or ‘50%’) See Note 4
INCIDENTAL MATERIALS See Note 9
VOLATILITY
Distillation 123 D86 or D7345., See Note 10
Initial Boiling Point, ºC Report
Fuel Recovered See Note 10
10% v/v at ºc Max 205.0 Or IP 406 or D 2887
50% v/v at ºC Report see Note 11
90% v/v at ºC Report
End Point, ºC Max 300.0
Residue, % v/v Max 1.5
Loss, % v/v Max 1.5
Flash Point, ºC Min 38.0 170 or 523 D 56 or D 3828 See Note 12
Density at 15ºC, kg/m³ 775.0 min to 840.0 max 160 or 365 D 1298 or D 4052
FLUIDITY
Freezing Point, ºC Max -47.0 16 or 435 or 528 or 529 D 2386 or D 5972 or D 7153 or D 7154 See Note 13 and 14
Viscosity at -20ºC, mm2/s(cSt) Max 8.000 71 D 445 D7945 or D7042, See Note 15
COMBUSTION
Specific Energy, net, MJ/kg Min 42.80 12 or 355 D 3338 or D 4809 See Note 16
Smoke Point, mm Min 25.0 598 D 1322 See Note 17
OR
Smoke Point, mm Min 18.0 598 D 1322 See Note 17
AND Naphthalenes, % vol Max 3.00 D 1840
CORROSION
Corrosion, Copper strip, classification (2 hours +/- 5 min. at 100 ºC +/- 1ºC) Max 1 154 D 130
STABILITY
Thermal Stability (JFTOT) 323 D 3241 See Note 18
Control temperature, ºC Min 260
Filter Pressure Differential, mm Hg Max 25
One of the following requirements shall be met:
(1) Annex B VTR Less than 3, no 'Peacock' or 'Abnormal' colour deposits
(2) Annex C ITR or Annex D ETR, average over area of 2.5mm² nm Max 85
CONTAMINANTS
Existent Gum, mg/100ml Max 7 540 D 381
Microseparometer (MSEP), rating D 3948 See Note 19
Fuel with Static Dissipator Additive Min 70
OR
Fuel without Static Dissipator Additive Min 85
CONDUCTIVITY
Electrical Conductivity, pS/m 50 min to 600 max 274 D 2624 See Note 20
LUBRICITY
BOCLE wear scar diameter, mm Max 0.85 D 5001 See Note 21
ADDITIVES (Names and approval code from DEF STAN 91-091 should be quoted on quality certificates).
Antioxidant, mg/l in final batch (Optional) Max 24.0 See Note 22 and 23
Metal Deactivator, mg/l (Optional) *
First Doping Max 2.0 See Note 24
Cumulative concentration after field re-doping Max 5.7
Static Dissipator, mg/l*
First Doping Max 3.0
Cumulative concentration after field re-doping Max 5.0
Antioxidants are still mandatory for synthetic fuels and shall be added prior to or during release from the designated manufacturing site of the ASTM D7566 component. The types and concentrations of all additives used shall be shown on the original Certificates of Quality and on all other quality documents when they are added downstream of the point of manufacture. When additives are diluted (with hydrocarbon solvent only) to improve handling properties prior to addition, it is the concentration of active ingredient that shall be reported. See Annex A of DEF STAN 91-091 for detailed advice.
Fuel System Icing Inhibitor is not permitted unless agreed by all the participants in a joint system (see also Note 25). See Note 26 about requirements for management of change in refineries.
Lubricity Improver Additive (LIA) additive may be added to the fuel without prior consent of the joint system participants (see also Note 21) * When the original dosage of additives is unknown, it has to be assumed that first doping was applied at maximum dose rate.

Notes

Main Table Notes: See AVIATION FUEL QUALITY REQUIREMENTS FOR JOINTLY OPERATED SYSTEMS (AFQRJOS): Issue 31 – Nov 2019 (supersedes Issue 30 – Nov 2018)
http://www.jigonline.com/wp-content/uploads/2019/11/Bulletin-125-AFQRJOS-Issue-31-Nov-2019-FINAL-revised-090220.pdf

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