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What is this "black box" at the top of Apollo 17 CM?

Space Exploration Asked on December 28, 2021

An Apollo 17 recovery image of the top of the CM, ap17-S72-55888 from ALSJ.

enter image description here

What is the black box under the parachute mortar? See the green rectangle.

It might be a part of the recovery system, a flashing beacon light or a radar transponder.

2 Answers

I am not 100 % confident in this answer. I found an Apollo 16 image S72-36328 from ALSJ:

enter image description here

I added green arrows to indicate three electronic boxes, a red arrow to the flashing recovery (light) beacon and two cyan arrows to recovery antennas.

enter image description here

Figure 1-9 from the Apollo Recovery Operational Procedures Manual showing both VHF recovery antennas and the flashing light beacon.

enter image description here

From Earth Landing Subsystem

So the left box (of the top image) is the Sea Dye Marker and Swimmer's Umbilical, not an electronic box.

The two boxes to the right could be the flashing light power supply and the VHF recovery antennas electronic.

To build a powerful flashing light recovery beacon large condensators are needed to store the energy for a powerful bright flash. The flashing light should be visible in bright sunlight over large distances. So the bigger black box should be the flash light power supply and the smaller grey box the VHF recovery electronic.

Answered by Uwe on December 28, 2021

I am not 100% confident in this answer. But I think it is the power supply for the flashing beacon light.

The flashing beacon light itself is indicated in this crop of the picture from the question.

enter image description here

From this diagram extracted from the News Reference Manual the beacon power supply / battery box is in the right place. But the drawing is not clear.

enter image description here

Answered by Organic Marble on December 28, 2021

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