大気観測装置を搭載する航空機

Aircraft Installation

Prologue

Newly developed equipments are installed on two Boeing 747-400s and three Boeing 777s operated by Japan Airlines and one beechcract 65 JAXA owns.

　


<Boeing 747-400>	<Boeing 777>	<Beechcraft 65>(reference）
ASE and CME are installed in the cargo compartments of JA8917 and JA8921JAL operates.	CME is installed in the cargo compartment of JA703J, JA705J, and JA707J JAL operates.	In the cabin compartment of JA5111 JAXA owns, CME is installed.

　Note ：JAxxxx represents registration number given for each aircraft.

Boeing 747-400

	Boeing 747-400 was designed and developed in the late 1980s and introduced to JAL from 1990 as a successor of Boeing 747 classic aircraft. External appearance and dimensions are similar to the Boeing 747 classic, except winglet of the wing tip. However, several advanced avionic technologies were adopted such as a two-men cockpit. Boeing 747-400 series have international, domestic and freighter version. The aircraft used by the atmospheric observation is an international configuration.


Fig.１．Location and installation of CME and ASE for 747-400

Fig.1 shows installation of each measuring equipments(ASE and CME) and its peripheral parts such as ASE pump. ASE and CME are installed beside four water tanks at the after-bulkhead of forward cargo compartment.
Air samples are extracted at the air conditioning duct located under the cabin floor shown in the Fig.1 and then routed to the equipments via the metal tube. The air measured originally comes from the engine intake. Temperature is increased by the engine compressor and then regulated by the air-conditioning pack to a suitable temperature and pressure and released into the air-conditioning duct.

The first 747-400 aircraft modification was conducted in October 2005 and required certifications from FAA and JCAB were obtained after required ground test and flight test were conducted. The aircraft was then placed in the flight line for trial observation.

In February 2006, the second 747-400 aircraft, JA8921, was modified and observation commenced.

Boeing 777

	Boeing 777 was developed in the late 1990s as a twin engine long range aircraft. It uses further advanced technologies from the 747-400 and has excellent economical performance including better fuel consumption than previous three engine and four engine aircraft. The aircraft which equips the atmospheric observation device is 777-200ER international configuration.


Fig.2．777-200ER Installation and location of CME

Fig.2 shows installation and location of the CME of 777-200ER.

The CME is installed between aircraft skin and inner liner of the forward cargo compartment.

Air samples are extracted from the air conditioning duct in a similar way to the 747-400. They are taken from the rear of the compartment and drew into the CME through metal tubing.

Aircraft modifications for the installation of the CME for the first aircraft, JA705J, was completed in March 2006 and the certification from FAA and JCAB were obtained.
Two additional aircraft, JA703J and JA707J, were modified in November 2006 and observation commenced.

Beechcraft 65 (reference)

Since Beechcraft 65 is unpressurized differently from Boeing 747-400 and 777 which flies at high altitudes, an external pump was provided in addition to the CME internal pump to take sample air.

The sample air comes from a dedicate intake located at the upper fuselage and enters into the CME through the auxiliary pump.

The aircraft was modified in February 2005 to install the CME and obtained JCAB approval for repair modification inspection. Observation over Sagami-bay is conducted approximately two times per month.