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plane could remain airborne for 15-20 minutes, and that Lajes airbase was an estimated 20
minutes away.
d The crew decided to take action to correct the anomaly, opening a cross-feed valve to
transfer fuel from the left tank to the right tank.

c Make opposites of the following words using the prefixes in the box.
ab- dis- im- in- (x4) ir- mal- over- un-

1 correct incorrect 7 proportionate
2 undersized 8 regular
3 adequate 9 balance
4 detected 10 function
5 normal 11 operable .
6 sufficient

d Complete the following sentences using the words in Exercise 9c. Sometimes more than
one word is possible.

1 The temperature gauge was faulty. That’s why it was giving
readings.
2 The shaft was thinner than it should have been, so its strength was .
3 The power output from the motor varies. We don’t understand why it’s .
4 The bolt’s It’s too big to fit into the hole.
5 The machine’s not working as it should. There’s some kind of .
6 The braking force on both front wheels should be the same. There shouldn’t be
an .
7 The fault was . None of the maintenance technicians had noticed
it.
8 The control panel isn’t working, so you can’t control the machine. It’s totally
.

10a ► 5.4 Julia, an aircraft service technician, is phoning Alan, a colleague, about a
problem with the tyres on a plane. Read the conversation and mark the statements True
(T) or False (F).
1 The tyre pressures on the block being discussed are OK.
2 There is too little air inside some of the tyres.
3 The tyre pressures are the same across the aircraft.
4 The degree of wear across all the tyres is the same.

Alan: Hello.
Julia: Hello Alan, it’s Julia. I’ve just started a landing gear check and found a bit of a problem
with some tyres. All the pressures on one of the wing blocks are well down.
Alan: On the same block?
Julia: Yeah. On all the other blocks they're correct. So it seems odd that this one group of tyres,
on one corner of the aircraft, are all low. And the strange thing is, they're down by exactly the
same amount on every tyre on the block. Alan: I see. You’re right, that is unusual.
Julia: The wear rate’s consistent across the whole aircraft, though. There’s nothing unusual
about the wear pattern.
Alan: Are you sure the pressure gauge is working properly?
Julia: Urn, well, to be honest you can tell just by looking at the tyres that they're down.

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