. . . . . . . "Operator's and crewmember's checklist Army model AH-1P (PROD), AH-1E (ECAS), AH-1F (modernized Cobra) helicopters"@en . "Handbooks and manuals"@en . . . . . "Army model AH-1P (PROD), AH-1E (ECAS), AH-1F (modernized Cobra) helicopters"@en . .