British Airways Modification Number EOC-CON-034G286 / Installation of AlliedSignal RDR-4B Weather Radar System to the whole BA fleet

 

CAA NOTE: BA Fleet – Installation of AlliedSignal RDR-4B Weather Radar System

 

AIRWORTHINESS APPROVAL NOTE NO: 27025

 

APPLICANT: British Airways PLC

 

AIRCRAFT TYPE: Concorde Type 1 Variant 102

 

REGISTRATION NO: G-BOAA, G-BOAB, G-BOAC, G-BOAD,

 

G-BOAE, G-BOAF, G-BOAG.

 

CONSTRUCTOR’S NO: Various

 

British Airways Modification No. EOC-CON-034G286

 

Installation of AlliedSignal RDR-4B Weather Radar System

 

1. Introduction

 

Due to obsolescence of the AVQ-30X weather radar, a new Concorde weather radar is required. A trial of the AlliedSignal RDR-4B Radar has been successfully completed under cover of trial modification 34D491 on registration G-BOAA. Modification BA EOC-CON-

 

034G286 formalises the new radar fitment on G-BOAA and the rest of the Concorde fleet.

 

It should be noted that the predictive wind shear capability provided by the RDR-4B has been disabled for this modification.

 

2. Requirement Basis

 

BCAR Section R4-6 with Appendix No. 5.

 

3. Description

 

The original modification was re-certificated with the FAA to meet the Concorde operating environmental limits and approved by the CAA under VC 371. An adapter tray for the T/R is used and minor system wiring changes are required to replace the RCA AVQ 30X radar system presently used on the Concorde fleet.

 

A complete system description is contained in British Airways Technical Statement Doc ref.

 

ESA.101.HCW.1743.

 

Description Type Part Number Quantity

 

Transceiver Unit RTA-4B 066-50008-0406 2

 

R/T Mount MBA-4B 2041214-0410 1

 

Indicator PPI-4B 2041222-0401 2

 

Control Panel CON-4B 2041220-1413 1

 

Scanner Drawing ASO4-61643 1

 

Antenna Drive DAA-4A 2041444-0404 1

 

Antenna REA-4B 2041446-0401 1

 

Antenna & Drive assembly – 4-61643 1

 

3.1 Interchangeability Data

 

Receiver-Transmitter: Type RTA-4B, P/N 066-50008-0406 may be replaced by

 

Type RTA-4B, P/N 066-50008-0405 or

 

Type RTA-4A, P/N 066-2041217-0422.

 

Control Panel: Type CON-4B, P/N 2041220-1413 may be replaced by

 

Type CON-4B, P/N 2041220-0406.

 

Indicator: Type PPI-4B, P/N 2041222-3401 may be replaced by

 

Type PPI-4B, P/N 2041222-0401 or

 

Type PPI-4B, P/N 2041222-0403.

 

The technical differences between equipment alternatives listed above are minor and are

 

described in BA Technical Statement ESA.101.HCW.1743.

 

The receiver-transmitter’s referred to above are all CAA approved under VC 00371.

 

4. Investigation

 

The original modification 34D491 was covered by BA Technical Statement Ref. EEG.2.-

 

HCW.1430/M2.14 is satisfactory and meets CAA airworthiness requirements.

 

The AlliedSignal RDR-4B has been installed on this aircraft for a number of months on a trial evaluation. This evaluation is now complete and British Airways wish to formally convert the trial installation into a production modification.

 

5. Ground Test

 

The performance and EMI tests were satisfactory and the results are detailed in BA report

 

ESA.101.HCW1819. Note: EMI testing was performed using PPI 2041222-0401 only. An addendum to BA report ESA.101.HCW1819 will be issued at a later date to reflect EMI testing with PPI 2041222-3401 when the equipment is available.

 

6. Flight Test

 

The first scheduled flight after the original modification was satisfactory.

 

The test flight for the modification covered by the trial modification was also satisfactory and the results are detailed in BA report ESA.101.HCW1818.

 

7. Flight Manual

 

No change was required for the original modification, but crew operating procedures are covered by instructions from Flight Manager’s Technical (FMT’s )Office

 

The modification covered by this AAN also required no changes to the Flight Manual. The crew operating instructions are covered in instructions in the FMT’s Office

 

8. Master Minimum Equipment List

 

The original modification required no change to be made to the MMEL.

 

The modification covered by this AAN also requires no change to be made to the MMEL.

 

9. Limitations and Concessions

 

None

 

10. Approval

 

This modification is approved for embodiment on this aircraft and any other aircraft of the same type and series.

 

K M HALLWORTH

 

…………………………………………

 

For the Civil Aviation Authority

 

Date 16 June 1999