, shall be : Type IV High Density HD : 990 to 1 066 Type IV & V Low Density LD : 970 to 1 020 NSA307110 Issue : Mar 04 Page : 5 AIRBUS FRANCE 2004. All rights reserved 4.4 - Acidity index "AI" (all fluid types) The acidity or alkalinity of the fluid shall be determined usi...