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CORROSION PREVENTION MANUAL
NAVIGATION

THIS PAGE INTENTIONALLY LEFT BLANK

Volume 2-757

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CORROSION PREVENTIONMANUAL
RADIO ALTIMETER ANTENNA

1. General

A. There  are six radio altimeter antennas on the bottom of the fuselage. Intru-sion of water at the antenna connector base will cause delamination and cor-rosion and eventually cause the antenna to be inoperable.

2.  Corrosion Prevention

A. Periodically  inspect the antennas for evidence of corrosion. Refer to Main-tenance Manual Subject 34-33-02 for removal procedure.

B.  If corrosion is evident, replace with new antenna.

C. Clean faying surfaces of antenna and mounting surfaces and apply Alodine
1200. Airplanes line number 94 and on, plus those incorporating SB 34-0025,
will have the antenna bases packed with grease.

D. Apply BMS 3-23 to the connector base, including the nuts. Pack the connector
base with BMS 3-24 grease from the 0-ring on the backplate to above the nuts
on the connector base.

E.  Install and test the antenna per MM 34-33-02.

Volume 2-757

34-30-01
Page 1
OCT 01/00

CORROSION PREVENTION MANUAL
RADIO ALTIMETER ANTENNA

RADIO ALTIMETER ANTENNA (CENTER) DETAIL I
RADIO ALTIMETER ANTENNA
(LEFT SHOWN, RIGHT OPPOSITE)
DETAIL II

AERODYNAMIC SEALANT (TYPICAL)
DETAIL III

DETAIL IV

Radio Altimeter Antenna
Figure 1

Volume 2-757

34-30-01

Page 2
OCT 01/00

CORROSION PREVENTION MANUAL
TRAFFIC ALERT AND COLLISIONAVOIDANCE SYSTEM (TCAS)

1. General

A. This system includes an antenna installed in the bilge area on the bottom
skin of the airplane, at station 446.50. Water can collect in the low area
around the hole in the skin, ring doubter, and coverplate. This can result
in corrosion of the antenna connectors.

2. Corrosion Prevention

A. Make  regular checks of the antenna connectors for corrosion. To prevent cor-rosion, install a moisture guard at the antenna location per SB 34-0073.

Volume 2-757

34-40-01
Page 1
OCT 01/00

CORROSION PREVENTION MANUAL
TRAFFIC ALERT AND COLLISIONAVOIDANCE SYSTEM (TCAS)

E3 ELECTRICAL RACK REMOVED

Traffic Alert and Collision Avoidance System Lower Antenna
Figure 1 (Sheet 1)

Volume 2-757

34-40-01
Page 2 OCT 01/00
CORROSION PREVENTION MANUAL
TRAFFIC ALERT AND COLLISION AVOIDANCE SYSTEM (TCAS)

SECTION A-A

Traffic Alert and Collision Avoidance System Lower Antenna
Figure 1 (Sheet 2)

Volume 2-757