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On .ight 202, a second PCA-equipped FADEC was installed on the other wing engine. Ground tests were successful, but in .ight it was found that the PCA system could not be engaged because of what was later determined to be a timing problem. (The PCA closed-loop bench test could only incorporate one FADEC; when two FADECs were present, additional time was required to complete the initialization and data bus handshakes.) This problem was diagnosed, corrected in the FCC software, checked out, and was ready for .ight test in about 2 weeks. The time for engagement was increased from 0.5 sec to an MCDU-adjustable value with a default of 2.5 sec. Following a successful ground test, .ight 221 was .own. PCA system engagement tests were all successful with the 2.5-sec handshake time, which remained unchanged for the rest of the .ight test.
After the disengage safety tests were completed, the PCA .ight test program began by assessing the operational characteristics at 10,000 ft in smooth air. At the 10,000 ft altitude in smooth air, pitch and track control were very good. Commanded track was held within a degree. Two con.gurations were tested: a gear-down, .aps-up condition at about 220 kn and a takeoff con.guration with Flaps 28 and gear extended at about 175 kn. Pilots A and B were impressed that PCA initially performed almost as well as the normal autopilot; the PCA controlled .ightpath to a few tenths of a degree and, with a level .ightpath command, held altitude to within ± 20 ft.
Table 2. PCA test .ights of MD-11.
Flight  Date  Location  Objective  Remarks 
200  5 Aug 95  Yuma  Single FADEC test  Software load problem, no data 
201  7 Aug 95  Yuma  Single FADEC test  All tests OK, open-loop steps 
202  8 Aug 95  Yuma  Two FADEC tests, PCA test  Could not engage, timing problem 
221  27 Aug 95  Yuma  Two FADEC tests, PCA test  PCA pitch and roll tests good 
222  27 Aug 95  Yuma  Two FADEC tests, PCA test  Turbulent air approaches 
223  29 Aug 95  Yuma  PCA landings, no engage  Landed and reset FADEC faults 
Good, light turbulence and 
224  29 Aug 95  Yuma–Edwards  PCA landings  thermals 
225  29 Aug 95  Edwards  PCA landings  Good, turbulence and thermals 
Edwards approach and sweeps 
226  29 Aug 95  Edwards–Yuma  en route  Moderate turbulence at Edwards 
Two hydraulics off, CG upsets, 
234  15 Sep 95  Yuma  high, fast  Slats only and rudder offset, 5 hr 
247  16 Nov 95  Yuma–Edwards  ILS-coupled PCA test  Boeing demonstration 
248  16 Nov 95  Edwards  ILS-coupled approaches  Edwards and Palmdale, good 
249  16 Nov 95  Edwards–Yuma  Return to Yuma, steps, sweeps  PCA and rudder, ILS into Yuma 
Edwards, steps, enhanced, ILS 
252  28 Nov 95  Yuma–Edwards  land  ILS autoland at 1 ft/sec 
All hydraulics off tests, clean 
253  28 Nov 95  Edwards  approach  Flew 25 min without hydraulics 
254  29 Nov 95  Edwards  Demonstration .ight  Airbus, Navy, Saudi, AA, DL 
255  30 Nov 95  Edwards  Demonstration .ight  USAF, JAL 
Demonstration .ight and ILS 
256  30 Nov 95  Edwards  land  Media demonstration 
257  30 Nov 95  Edwards  Demonstration .ight  FAA, Swissair 
258  30 Nov 95  Edwards–Yuma  Return to Yuma 
266  15 Dec 95  Yuma  Throttle steps and sweeps  High gross weight 

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