411A,
scanscan is quite correct all the BA aircraft and some CAA recognised airlines like GF had PVD.
The system was not FAA approved only CAA. When the GF Tristars were sold to the USA (Arrow and Interlease) the PVD had to be removed as it not approved.
Re the autopilot yes one of the best - designed in part by a Brit !!
When one of the Court line aircraft were delivered in 72 the original delivery flight was from Palmdale to Portland Oregon (for Tax reasons!!) and was flown by a Lockheed crew totally on Autpilot from takeoff roll to stopped on the runway.
When dealing with Lockheed Martin Greenville you should note that L1011 production and product support was originaly co-located in Burbank and Palmdale CA.
After Lockheed production closed Product Support was moved to Atlanta GA area and many of the original L1011 people moved.
Product support has now moved to Greenville SC and virtually no one moved. The info from Greenville is only as good as the paperwork (or the desire to research the paperwork) and not from hands on knowledge that was available in CA and GA