GB552557A - Improvements in the operation of aircraft retractable alighting gear - Google Patents
Improvements in the operation of aircraft retractable alighting gearInfo
- Publication number
- GB552557A GB552557A GB860441A GB860441A GB552557A GB 552557 A GB552557 A GB 552557A GB 860441 A GB860441 A GB 860441A GB 860441 A GB860441 A GB 860441A GB 552557 A GB552557 A GB 552557A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- undercarriage
- jacks
- conduit
- actuating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C25/00—Alighting gear
- B64C25/02—Undercarriages
- B64C25/08—Undercarriages non-fixed, e.g. jettisonable
- B64C25/10—Undercarriages non-fixed, e.g. jettisonable retractable, foldable, or the like
- B64C25/18—Operating mechanisms
- B64C25/22—Operating mechanisms fluid
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Aviation & Aerospace Engineering (AREA)
- Mechanically-Actuated Valves (AREA)
Abstract
552,557. Fluid-pressure servomotor-control systems. PHILLIPS & POWIS AIRCRAFT, Ltd., and MILLS, F. G. July 8, 1941, No. 8604. [Class 135] [Also in Group XXXIII] The retraction or extension of aircraft alighting gear, particularly the extension of the gear prior to alighting, is effected automatically by means sensitive to variations of airspeed or altitude independently of any action by the pilot. As shown, two jacks 19 for actuating an undercarriage, are supplied with pressure fluid from a pump 4 through a distributing valve 10 which is normally controlled by a manually-actuated lever 12 on a shaft 13 having an arm 14 connected by a link 15 to a lever 16 for moving the valve. The distributing valve 10 directs pressure fluid alternatively to the pipes 17, 18 leading respectively to the upper and lower ends of the jacks, return flow being through the other pipe and through a pipe 20 to a supply reservoir 3. The conduit 17 for extending the jacks includes a valve casing 25 connected by a pipe 24 to an electricelly-controlled valve 22 adapted to put the conduits 17 and 24 into communication with a comoressed air bottle 21 to effect rapid extension of the undercarriage when contacts 32, 33 are closed under the influence of a pressure sensitive device 35 operative upon a reduction of air speed prior to landing or upon the attainment of a predetermined atmospheric pressure. Consequently the under-carriage is extended automatically if it has not already been lowered by the pilot. The actuating device 28 of the valve 22 also actuates an explosive or other alarm to warn the pilot of his error and the valve 10 also is actuated to open the pipes 18 to exhaust by a lever 37 on the shaft 13 connected by a spring link 38 to the valve 22 or its actuating gear. Alternatively pressure relief valves may be provided on the jacks and in any case a pressure relief valve 27 is provided on the casing of the valve 10. Where automatic actuation without emergency actuation is required the air bottle 21 is omitted and the device 28 is connected directl yto the lecer 16. The valve casing 25 includes a ball valve 26 which normally closes the conduit 24 but upon emergency extension ot the undercarriage it is forced to the left to close the conduit 17 leading to the valve 10. The contacts 32, 33 are in series with switches controlled respectively by the landing flaps and the undercarriage position indicator so that the automatic device only functions when the flaps are down and the undercarriage still retracted. A manual cut-out switch is provided which may be opened also when the fuel cock is closed prior to a forced landing. The device may be used for automatically retracting an undercarriage by arranging the valve 25 in the conduit 18. An electro-motor may be used for actuating the undercarriage instead of the jacks 19 the motor circuit being actuated through a relay by the contacts 32, 33. Disturbance of trim due to actuation of the undercarriage may be corrected by connections from the undercarriage to the elevator or trimming tabs or biasing gear.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB860441A GB552557A (en) | 1941-07-08 | 1941-07-08 | Improvements in the operation of aircraft retractable alighting gear |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB860441A GB552557A (en) | 1941-07-08 | 1941-07-08 | Improvements in the operation of aircraft retractable alighting gear |
Publications (1)
Publication Number | Publication Date |
---|---|
GB552557A true GB552557A (en) | 1943-04-14 |
Family
ID=9855670
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB860441A Expired GB552557A (en) | 1941-07-08 | 1941-07-08 | Improvements in the operation of aircraft retractable alighting gear |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB552557A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1230318B (en) * | 1963-04-11 | 1966-12-08 | Andrew Paul Huchala | Airplane with flaps and retractable landing gear |
WO2005077757A1 (en) * | 2004-02-09 | 2005-08-25 | The Boeing Company | Methods and systems for operating aircraft landing gears |
CN110667828A (en) * | 2019-08-30 | 2020-01-10 | 南京精微迅智能科技有限公司 | Unmanned aerial vehicle supervisory equipment intelligence support |
CN112109895A (en) * | 2020-08-11 | 2020-12-22 | 宿州市植检植保站 | Unmanned aerial vehicle spray control method based on temperature and pressure monitoring |
CN113200142A (en) * | 2018-02-28 | 2021-08-03 | 空中客车营运有限公司 | Landing gear system control |
US12017755B2 (en) | 2019-06-27 | 2024-06-25 | Airbus Operations Limited | Controlling movement of landing gear or landing gear bay doors |
-
1941
- 1941-07-08 GB GB860441A patent/GB552557A/en not_active Expired
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1230318B (en) * | 1963-04-11 | 1966-12-08 | Andrew Paul Huchala | Airplane with flaps and retractable landing gear |
WO2005077757A1 (en) * | 2004-02-09 | 2005-08-25 | The Boeing Company | Methods and systems for operating aircraft landing gears |
CN100441478C (en) * | 2004-02-09 | 2008-12-10 | 波音公司 | Methods and systems for operating aircraft landing gears |
CN113200142A (en) * | 2018-02-28 | 2021-08-03 | 空中客车营运有限公司 | Landing gear system control |
US12017755B2 (en) | 2019-06-27 | 2024-06-25 | Airbus Operations Limited | Controlling movement of landing gear or landing gear bay doors |
CN110667828A (en) * | 2019-08-30 | 2020-01-10 | 南京精微迅智能科技有限公司 | Unmanned aerial vehicle supervisory equipment intelligence support |
CN112109895A (en) * | 2020-08-11 | 2020-12-22 | 宿州市植检植保站 | Unmanned aerial vehicle spray control method based on temperature and pressure monitoring |
CN112109895B (en) * | 2020-08-11 | 2022-03-25 | 宿州市植检植保站 | Unmanned aerial vehicle spray control method based on temperature and pressure monitoring |
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