Issued 03-13-08 • Prepared by SC-211

This document contains Minimum Operational Performance Standards (MOPS) for rechargeable Lithium battery systems to be used as permanently installed power sources on aircraft. Compliance with these standards is recommended as a means of assuring that the Lithium battery will perform its intended function(s) safely, under conditions normally encountered in aeronautical operations. These standards apply to the chemical composition, cell size, cell construction, cell interconnection methods within batteries, venting provisions, operational and storage environments, packaging, handling, test, storage and disposal of rechargeable Lithium batteries, installed separately or in avionics equipment aboard aircraft.

Issued 03-13-08 • Prepared by SC-159

The document contains Minimum Operational Performance Standards (MOPS) for airborne navigation equipment using signals from the Global Navigation Satellite System (GNSS) augmented by a Ground-based Regional Augmentation System (GRAS). The document defines minimum performance requirements, functions and features for GRAS airborne equipment to support all phases of flight including en-route, terminal, LNAV (Lateral NAVigation), LNAV/VNAV (Lateral NAVigation/Vertical NAVigation), LP (Localizer Approach with FAS data but without vertical guidance), LPV (Localizer Precision with Vertical guidance) (but not CAT-I/II/III). GRAS equipment will be compatible with the Ground Based Augmentation System (GBAS) and will be able to use the signal in space for approved approach operations. Compliance with these standards by manufacturers, installers and users is recommended as a means of assuring that the equipment will satisfactorily perform its intended functions under conditions encountered in routine aeronautical operations.

Issued 03-13-08 • Prepared by SC-212

This MOPS defines a Helicopter Terrain Awareness and Warning System (HTAWS), Airborne System. The HTAWS is an alerting system intended to provide terrain and obstacle aural and visual alerts. It is designed to reduce the risk of Controlled Flight into Terrain (CFIT) accidents by providing increased situational awareness of the surrounding terrain and obstacles, mainly during the cruise phase in Visual Meteorological Condition (VMC) and in Instrument Meteorological Condition (IMC) under Instrument Flight Rules (IFR). HTAWS is not intended to be used as an aid for navigation.

Issued 03-13-08 • Supersedes DO-235A • Prepared by SC-159

This document supersedes DO-235A. It departs from the previous assessment reports by characterizing the "external" (non-aeronautical) Radio Frequency Interference (RFI) as an aggregate effect. Terrestrial RFI sources are modeled as being distributed to the radio horizon for the Global Navigation Satellite System (GNSS) aircraft antenna. On-board non-aeronautical RFI is also characterized as an aggregate effect from multiple sources distributed throughout the passenger cabin. Explicit location-dependent GNSS inter- and intra-system RFI power spectral density values are computed based on "critical-satellite" configurations for a 30-satellite GPS constellation. RFI components for new Space Based Augmentation System (SBAS), Quasi-Zenith Satellite System (QZSS) and Galileo satellite constellations are also determined. Receiver MOPS RFI test condition modifications are proposed to better address the composite aeronautical and non-aeronautical RFI environment for certain flight phases and operations. New potential RFI sources (Mobile Satellite Service ancillary terrestrial component terminals, GPS re-radiators) are discussed. Other potential RFI sources are reviewed and a set of RFI mitigations discussed.