Post #59
Wow! Takes me back 45 years! Excellent link. Couple of points:
- at the bottom of each HSI is the 'drift shutter'; when switched right the caption was blank and in heading mode the autopilot/flight director would fly the
heading demanded by the heading bug. When selected left the caption AUTO appeared and Doppler drift was applied. The APFD would then fly the
track demanded by the heading bug.
- the moving map (Doppler driven) was never used because it was too unreliable; IIRC the original design featured a pen to physically draw a record of the track actually flown on the map.
- the T3 had an extra yaw damper to compensate for the reduced directional stability caused by the lengthened forward fuselage; flight with dampers off was demo'd during training - very unsettling!
- the boost engine reliability was poor - fortunately it was only needed occasionally - high aircraft weight on hot days or on short or contaminated runways (snow/slush).
Yes the "all-flying" tailplane, like the other primary controls, was driven by three hydraulic jacks, one for each hydraulic system.
The hydraulic systems were labelled green, blue & yellow. When needing to go back to the cabin to use the toilet the pilots would refer to 'just going back to offload the yellow hydraulics'.