asked the Secretary of State for Trade whether he will publish the monitored noise measurements for Concorde on its recent flights from Heathrow Airport and give comparisons for noise level and duration with other aircraft using the airport.

The maximum noise levels recorded by Concorde at the permanent monitoring points during its first nine commercial flights at Heathrow, together with the duration of the noise recorded above 90 PNdB, are shown in the following tables, together with the noise levels of the six immediately preceding and succeeding aircraft:

Aircraft	Maximum noise level PNdB)	Duration of noise above 90 PNdB (seconds)
21st January
DC9	98	24
Trident	105	37
Trident	109	44
Trident	102	38
Boeing 747	107	6
Caravelle	103	37
CONCORDE	112	42
Boeing 707	98	34
Boeing 707	100	41
Boeing 747	96	19
Boeing 747	100	18
Boeing 747	97	20
Trident	113	42
26th January
Trident	112	32
DC8	99	28
Boeing 737	96	32
TU 134	102	27
Boeing 707	102	35
Boeing 747	95	14
CONCORDE	114	42
Boeing 727	103	15
HS 125	97	20
Trident	110	54
Boeing 707	105	42
Boeing 727	105	40
Boeing 707	105	46
28th January
Lockheed 1011	Below 90 PNdB
DC9	100	29
DC9	101	27
Boeing 727	102	24
Trident	110	43
Trident	112	35
CONCORDE	112	43
Trident	107	43
Trident	110	46
Trident	99	29
Boeing 737	97	32
Trident	105	30
Boeing 747	102	21

2nd February
DC9	99	21
Trident	108	36
Boeing 737	92	14
BAC 1–11	103	46
Trident	106	33
BAC 1–11	103	39
CONCORDE	112	25
HS 125	95	17
Boeing 737	Below 90 PNdB
Boeing 747	95	9
Boeing 747	99	17
Trident	105	39
Trident	106	30
4th February
Boeing 727	96	18
Trident	107	46
DC9	97	23
Trident	106	43
BAC 1–11	101	49
HS 125	98	19
CONCORDE	111	27
Trident	101	29
Boeing 747	106	20
Trident	106	41
Trident	106	35
Trident	98	31
Trident	104	35
9th February
Trident	110	35
Boeing 707	106	31
Boeing 707	116	46
Boeing 707	102	44
Super VC 10	107	50
Boeing 747	108	34
CONCORDE	109	49
BAC 1–11	106	65
Trident	108	38
Boeing 737	101	31
Boeing 727	107	28
Trident	108	52
A300B	Below 90 PNdB
11th February
Boeing 727	102	41
BAC 1–11	107	62
Boeing 747	96	13
Trident	111	50
Boeing 737	97	22
Trident	108	35
CONCORDE	112	46
Trident	111	45
VC 10	110	66
DC9	Below 90 PNdB
Trident	108	47
BAC 1–11	106	66
Boeing 747	99	25
16th February (morning take-off)
Trident	107	48
BAC 1–11	107	49
Trident	106	44
DC9	103	29
Trident	107	37
Boeing 707	99	34
CONCORDE	110	41
Trident	110	38
Super VC 10	111	53
Boeing 707	100	28
Boeing 727	102	31
Trident	111	47
Trident	106	38

16th February (afternoon take-off)
Trident	105	57
Boeing 707	106	20
Boeing 737	96	17
Trident	108	45
Trident	105	26
Trident	108	41
CONCORDE	112	40
Trident	102	40
Trident	108	38
DC9	96	12
Trident	107	39
Fokker 28	98	23
Super VC 10	106	34

I should emphasise that we shall need the results of many more movements than the first nine commercial flights before valid conclusions can be drawn.