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IS0
I NTE R NAT1 ON AL O RG A N I Z AT1 O N FOR
STA N DARD I ZATl O N
IS0 RECOMMENDATION
R 461
CONNECTIONS
FOR AIRCRAFT GROUND ELECTRICAL SUPPLIES
1st EDITION
November 1965
COPYRIGHT RESERVED
The copyright of IS0 Recommendations and IS0 Standards
belongs to IS0 Member Bodies. Reproduction of these
documents, in any country, may be authorized therefore only
by the national standards organization of that country, being
a member of ISO.
For each individual country the only valid standard is the national standard of that country.
Printed in Switzerland
Also issued in French and Russian. Copies to be obtained through the national standards organizations.
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BRIEF HISTORY
The IS0 Recommendation R 461, Connections for Aircraft Ground Electrical Supplies,
was drawn up by Technical Committee ISO/TC 20, Aircraft, the Secretariat of which is held by
the British Standards Institution (BSI).
Work on this question by the Technical Committee began in 1952 and led, in 1957, to the
adoption of a Draft IS0 Recommendation.
In May 1962, this Draft IS0 Recommendation (No. 508) was circulated to all the IS0
Member Bodies for enquiry. It was approved by the following Member Bodies:
Australia Israel Sweden
Belgium Italy Switzerland
Chile Japan Turkey
Czechoslovakia Netherlands United Kingdom
Denmark New Zealand U.S.S.R.
Finland Portugal Yugoslavia
France Spain
One Member Body opposed the approval of the Draft:
Germany
The Draft IS0 Recommendation was then submitted by correspondence to the IS0 Council
which decided, in November 1965, to accept it as an IS0 RECOMMENDATION.
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ISO/R 461 - 1965 (E)
CONTENTS
Page
1. Connections . . . 4
...
1.1 Direct current 4
.............................
1.1.1 28V 4
...............................
Aircraft plug Figure 1
Ground supply socket Figure 2
1.1.2 112V . 6
Aircraft plug Figure 3
Ground supply socket Figure 4
1.2 Alternating current, three-phase
115/200 V,400 Hz . 8
Aircraft plug Figure 5
Ground supply socket Figure 6
2. Typical wiring diagrams for plugs and sockets . 10
2.1 Direct current Figure 7 . 10
2.2 Alternating current, three-phase . 1 1
Ground supply socket wiring using, to actuate aircraft relay
- aircraft power Figure 8 (a)
Figure 8 (b)
- external direct current power
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ISO/R 461 - 1965 (E)
IS0 Recommendation R 461 November 1965
CONNECTIONS
FOR AIRCRAFT GROUND ELECTRICAL SUPPLIES
1. CONNECTIONS
Connections for aircraft ground electrical supplies, i.e. aircraft plugs and ground supply sockets,
should comply with the overall dimensions shown as follows.
1.1 Direct current
1.1.1 28 V
FIG. 1. - Aircraft plug
The length of engagement of the pins in
the socket should not be affected by the
method of mounting the aircraft plug.
Control pin should be used at
positive polarity, at the voltage
On pressurized mountings, this surface
of the main positive pin.
should be suitable to enable a sealed joint
to be made, when the shroud is passed
through the aircraft structure.
Dimension I Inches I Millimetres
J J
-
A I 2.125 10.03 I 54 f0.8 I
T _,_ 2
B I 2.0 10.015 I 50.8 +0.4 I
C I 0.75 10.015 I 19.1 *0.4 I
D I 3.062 +:.O4 I 77.77 +;
I
Li I-
y I-
O
-0.002
I
G 0.765 10.02 19.43 i-0.5
H 1.0 50.01 25.4 *0.25
\
Hole dimensions should be
suitable for the particular
J 2.234 56.7
plug.
K 1.672 42.5
Mounting dimensions
L 3.859 98
M I 0.24 6.1
I I
@El I
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ISO/R 461 - 1965 (E)
FIG. 2. - Ground supply socket
A
\
*--- - 1
I
i
U’
1
I---- -i
, \ I
I
l BL
I
k
I
I C
-
*
I- r
Beyond this point the overall dimensions Split socket for the control pin should be
should not exceed the envelope shown by
used at positive polarity at the voltage
the long-chain line in the plan view. of the socket for the main positive pin.
Individual socket inserts should have side play of f 0.02 in (& 0.5 mm). Fit of sockets for main
pins should be such as to limit the voltage drop at each main pin, measured between the cable
connections of the 1 -ound supply socket and the aircraft plug, to 20 mV at 450 A.
...