TristarSteve From Sweden, joined Nov 2005, 3977 posts, RR: 34
Reply 1, posted (6 years 5 months 4 weeks 1 day 7 hours ago) and read 1651 times:
It is a small strip fitted in the coaming in front of each pilot. It has rotating bars that provide directional guidance from the ILS for take off and landing.
It was introduced on the Trident by BEA in 1964 and has been fitted to many BEA and BA aircraft since. It was on the BA Tristar and B767 and B757 and was a requirement for Cat3B operation.
PhilSquares From , joined Dec 1969, posts, RR:
Reply 2, posted (6 years 5 months 4 weeks 1 day 6 hours ago) and read 1644 times:
Quoting TristarSteve (Reply 1): It was introduced on the Trident by BEA in 1964 and has been fitted to many BEA and BA aircraft since. It was on the BA Tristar and B767 and B757 and was a requirement for Cat3B operation.
It was an option on the 744 and it would cut the takeoff mins by 50% (IIRC). It was driven by the takeoff runway ILS and the trick was to keep the stripes from moving.
The PVD system consists of one PVD computer and two PVD indicators. The
PVD computer receives guidance commands from three FCCs. The FCC source
is selected with the FD/PVD source selector for the respective display.
Using the runway localizer tuned on the Navigation Radio page, the PVD provides
guidance to runway centerline during ground operations.
In practice, it was a terrible system and about 18 months ago SQ deactivated the system on the 744. It had no bearing on CATIIIB/C operations. It was merely for takeoff.
Pihero From France, joined Jan 2005, 4389 posts, RR: 76
Reply 6, posted (6 years 5 months 3 weeks 6 days 22 hours ago) and read 1500 times:
Hey, People !
If you forget the queen of Cat III B,aka The Tristar, with her PVD, we won't be friends for very long, I can assure you, and I know of one 411 who would be mighty pizzed with you lot !
So correct this ASAP !
Before he arrives...