Damaged is a spectrum from scratched paint to melted into the dirt. Was the other pad damaged enough to make it unusable for long enough to delay a realistic launch schedule?
On the face of it, yes.
The points of having 2 launch pads instead of one are: a) a faster launch rate and b) you have a backup launch pad in case the the other one is out of action for long periods or destroyed outright.
The gap of nearly 2 years between the failure of Serial 5L on 3rd July 1969 and the failure of Serial 6L on 26th June 1971 suggests that the other pad was put out of action for a long time too. If it hadn't been it's likely that they'd have attempted to launch Serial 6L several to many months earlier than they did.
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The above was written before I read the Wikipedia article on Baikonur Cosmodrome Site 110. According to that 5 launches was made from it. They were the 4 N1 failures and one of the 2 Energia launches.
Site 110/38 was used for the launches of 21st February 1969 and 3rd July 1969. It took over eighteen months to rebuild the pad.
The 3 subsequent launches were from Site 110/37. That is the N1 launch failures of 26th June 1971 and 23rd November 1972 and the successful launch of Energia-Buran on 15th November 1988.
The other Energia launch (the successful flight of Energia-Polyus on 15th May 1987) was made from Site 250, which according to Wikipedia was built in the late 1970s.
The Wikipedia article cites Mark Wade's astronautix.com as its source.
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According to Mark Wade (
http://www.astronautix.com/sites/baic110r.htm) the chronology of what he called Launch Complex 110R and Launch Pad 110 East was:
- 31.08.1967 - N1 Launch Pad 110 East completed.
- 07.05.1968 - N1 booster 4L erected at Launch Complex 110 East.
- A September 1968 flight test was planned.
- However the first stage LOX tank developed hairline cracks during ground tests.
- 4L was removed from the pad in June 1968.
- The first stage was cannibalized; the upper stages were incorporated into the 1M1 mockup for further training of the launch crews.
- 15.11.1968 - N1 1M1 mockup erected on pad with L1S payload Spacecraft: Soyuz 7K-L1.
- The N1 mockup was again erected on the pad, in order to conduct tests of the L1S payload in advance of the availability of the 3L launch vehicle.
- 26.12.1968 - N1 launch vehicle 3L erected on launch pad The 3L vehicle, without its payload (which was on the 1M1 mockup), is erected on the pad to test engine systems.
Then there were the failures of N1 3L on 21st February 1969 and the failure of N1 5L on 3rd July 1969. The latter destroyed Launch Pad 110 East and it took over 18 months to repair.
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And according to Mark Wade (
https://web.archive.org/web/20081031104701/http://www.astronautix.com/sites/baic110l.htm) the chronology of what he called Launch Complex 110L and Launch Pad 110 West was:
- 21.03.1963 - Design work starts on N1 launch complex.
- 01.09.1963 - Construction begins of N1 launch complex.
- 01.09.1964 - Construction starts on N1 Launch Complex 110 East
- 01.02.1966 - Construction starts on N1 Launch Pad 110 West.
- 25.11.1967 - N-1 mockup 1M1 rolled out to launch pad.
- It remained on the pad until 12th December for facilities checks.
- It was photographed by a US reconnaissance satellite on 11th December.
- The 1M1 mockup scrapped in 1975.
- 31.12.1968 - N1 Launch Pad 110 West completed.
- 24.09.1969 - N1 on Launch Pad 110 West.
- This was the first new launch vehicle erection activity detected by US reconnaissance satellites after the destruction of pad 110 east in the July launch failure.
- The all-white launch vehicle, with no payload, is believed to be either N1 mockup 1M1 or flight vehicle 6L.
- 18.05.1970 - N1 erected on Launch Pad 110 West.
- US reconnaissance satellites detects N1 being installed on the pad.
- It remained there, without payload, until at least 4th June.
Then he does the N1 launch failures of 26th June 1971, 23rd November 1973 and the Energia-Buran launch of 15th November 1988.
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So I was wrong. The failure of 3rd July 1969 didn't destroy both launch pads. Therefore, the gap of nearly 2 years between it and the next launch attempt must have been for another reason or reasons.