The battery useful life (or useful life of charge) requirements of this paragraph do not apply to batteries (such as water-activated batteries) that are essentially unaffected during probable storage intervals. The new expiration date for replacing (or recharging) the battery must be legibly marked on the outside of the transmitter. Batteries used in this transmitter must be replaced (or recharged, if the batteries are rechargeable) when the transmitter has been in use for more than 1 cumulative hour, or, when 50 percent of their useful life (or for rechargeable batteries, 50 percent of their useful life of charge) has expired, as established by the transmitter manufacturer under its approval. (c ) No person may operate an airplane in extended overwater operations unless there is attached to one of the life rafts required by paragraph (a) of this section, an approved survival type emergency locator transmitter. Except as provided in paragraph (c) of this section, no record need be kept more than 60 days. Any erasure made in accordance with this paragraph must be of the oldest recorded data accumulated at the time of testing. A total of 1 hour of recorded data may be erased for the purpose of testing the flight recorder or the flight recorder system. In addition, each certificate holder shall keep the recorded data prescribed in paragraph (b) of this section for an airplane until the airplane has been operating for at least 25 hours, and for a rotorcraft until the rotorcraft has been operating for at least 10 hours, of the operating time specified in paragraph (c) of this section. (d ) Except as provided in paragraph (c) of this section, and except for recorded data erased as authorized in this paragraph, each certificate holder shall keep the recorded data prescribed in paragraph (a) of this section until the aircraft has been operating for at least 25 hours of the operating time specified in paragraph (c) of this section. Performance requirements: Land aircraft operated over water.Įmpty weight and center of gravity: Currency requirement. Performance requirements: Aircraft operated over-the-top or in IFR conditions. Traffic Alert and Collision Avoidance System. Shoulder harness installation at flight crewmember stations.Īirborne thunderstorm detection equipment requirements.Īirborne weather radar equipment requirements.Įmergency equipment requirements for aircraft having a passenger seating configuration of more than 19 passengers. Radio altimeters for rotorcraft operations.Ĭommunication and navigation equipment for aircraft operations under VFR over routes navigated by pilotage.Įquipment requirements: Aircraft carrying passengers under IFR.Ĭommunication and navigation equipment: Extended over-water or IFR operations.Įmergency equipment: Extended overwater operations.Įmergency equipment: Overwater rotorcraft operations. The telescope was a joint project of NASA, the Netherlands Agency for Aerospace Programmes and the United Kingdom's Science and Engineering Research Council.Public address and crewmember interphone systems.įire extinguishers: Passenger-carrying aircraft.Įquipment requirements: Carrying passengers under VFR at night or under VFR over-the-top conditions. IRAS was a technical and scientific precursor to future infrared space missions including the Spitzer Space Telescope, James Webb Space Telescope, the Infrared Space Observatory, and the Herschel observatory. Because infrared light can penetrate dust and gas, even when visible light (the kind human eyes can detect) cannot, IRAS probed deeper into the core of our galaxy, the Milky Way, than any previous observatory. The mission made a number of unexpected discoveries, including: six new comets, evidence of dust grains around the stars Vega and Fomalhaut, which strongly suggested the existence of planetary systems around other stars. IRAS detected about 350,000 infrared sources, increasing the total number of cataloged astronomical sources by about 70%. Many infrared wavelengths are blocked by Earth’s atmosphere and therefore cannot be observed from the ground the IRAS mission showed that the universe is rich in sources emitting those infrared wavelengths. The Infrared Astronomical Satellite, or IRAS, was the first space telescope to study the sky in infrared light.
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