I can Autoland CATIII at other airports where the runways are designated as CATIII capable, but in 2 different flights from EBBR to EGLL, I was unable to have both CMD a/p buttons remaining lit during final approach and the CATiii landing failed in both cases.Does anyone know what I might have done wrong?
Configured Runway Length for 27R at Heathrow on the HUGS setup panel 12798 feet
Entered Runway Altitude in HUGS panel 79 feet
Confirmed 3 degree GLS in HUGS panel
Selected PRI in MODE for HUGS panel
STBY AIII ARM in HUGS panel
Set CRSE both seats for 271 degreesSet NAV1 and NAV2 both for 110.30 hzFollowing the above for other airports such as CYVR (Vancouver Int'l) the plane autolands including flare just fine. I simply push the nose down following touchdown and engage the reverse thrusters and then the brakes - spot on.None of this works as I expect at Heathrow.The A/P switches from Capt to FO (they will NOT both remain lit, even during the very final portion of the approach)Any suggestions will be most welcome - thanks.If perchance there is NO Cat3 capability at EGLL, I'd love to hear it, but that disagrees with what my other resources say.