1. SAIR127_EnBas
4/28/2019 4:23 PM
Gripen development
presented at Meeting No. 96 SAE Aerospace Control and Guidance System Committee Hilton Head, SC October
SAAB AEROSYSTEMS
Visual Presentation 2003

2. Wake vortex
Problem - AoA vanes might sense reduction in AoA/Nz initially at vortex passage - Elevons put in worse positions (compared to a/c without active FCS)
Wake vortex transient reduction functionality - Implemented in OFP R14:6 - Detection filter based on current AoA-information - Instant switching to complementary filtered AoA (instead of AoA based primarily on vanes position) at wake vortex detection - Ordinary AoA monitoring (CBIT) bypassed
Flight Test - FQ Level 1 previously proved with filtered AoA - All vortex passages detected and FCS reconfigured to filtered AoA as designed - Flight tests to verify models rather than characteristics - Detection filter behaviour at low level flight (less than 150 ft) with turbulence to be explored
SAAB AEROSYSTEMS

3. New functionality
Improved Maneuver Load Limiting function - New export external stores - Heavier a/c and more aft c.g. - Basic design stores combinations, ”care free” characteristics for all derivatives (nominal weapon release)
Coupled Control functionality - Automatic navigation - Automatic/optimized climb
Enhanced ALT mode - All attitudes (previoulsy limited to pitch angles of +/- 60 deg) - Increased authority (roll rate/nz) at ”unnormal” attitudes - Pilot Activated Fly Up
SAAB AEROSYSTEMS