曝光台 注意防骗
网曝天猫店富美金盛家居专营店坑蒙拐骗欺诈消费者
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
178
174
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
本文链接地址：Development and Flight Test of an Emergency Flight Control System Using Only Engine Thrust on an MD-11 Transport Airplane(23)
