The RMS module is one of the most talked-about parts of the DLR test—and for good reason. A sequence of numbers of unknown length is played aloud, stops suddenly without warning, and then you have to enter all the digits you heard in reverse order. It sounds simple, but it’s a real challenge the first time you try it. However, if you understand how it works and practice the right strategies, you can score well on this section.
What is the RMS test?
RMS stands for Running Memory Span and is one of the ten modules of the DLR Cockpit Certificate. It measures auditory working memory—more specifically, the ability to fully retain a sequence of numbers heard in your head and then correctly reproduce it in reverse order.
The connection to pilot aptitude is direct: In the cockpit, pilots must process instructions and information aurally, hold them in working memory, and handle them flexibly—often while dealing with distractions. The RMS tests precisely this fundamental ability in a controlled, standardized format.
Format and Procedure
Here’s how an RMS session works:
- A series of digits is presented audibly —one after the other, at a steady pace
- The length of the sequence is unpredictable —you don’t know when it will end
- When the sequence stops, you enter all the digits you heard in reverse order —that is, the last digit heard first, and the first digit heard last
- The length of the sequences varies and gets longer as the test progresses
- No pen, no paper—it’s all in your head
An example: You hear “4 — 7 — 2 — 9 — 1.” The sequence stops. You enter: “1 — 9 — 2 — 7 — 4.” That is the core of the module. The real challenge lies in the fact that, with an unknown sequence length, you don’t know how much capacity you need to allocate—and yet you must still retain every digit reliably.
What the test really measures
RMS is not purely a memory test. What is measured:
- Auditory working memory: Retaining heard number sequences completely and in the correct order in short-term memory
- Mental flexibility: Actively reversing the heard sequence—this is an additional cognitive step that must be consciously trained
- Resilience under uncertainty: Since the sequence length is unknown, attention must remain constantly high—you cannot “switch off” at a certain point
The unknown length is no coincidence—it prevents you from mentally preparing for a fixed number and tests your true capacity under realistic uncertainty.
The most common mistakes in the RMS
1. Forgetting to practice the reversal
Many test-takers practice memorizing number sequences—but neglect the reversal step. Reciting the sequence backward is a distinct cognitive skill that must be automated. Anyone who consciously applies it for the first time on test day loses valuable seconds.
2. Losing track of the first digits in long sequences
The longer the sequence, the further back in memory the first digits—which come last during backward recall—are. Those who lack a strategy to anchor them typically give up halfway through.
3. Typing too slowly
After the sequence ends, the time for typing begins. Those who type hesitantly or get stuck on the sequence lose points not because of a poor memory, but because of slow execution. Typing speed is part of the training.
4. Panicking during long sequences
When a sequence unexpectedly becomes long, some candidates mentally break down—even though they could still have recalled the first digits. Mental stability under increasing length must be trained.
Proven strategies for the RMS
Strategy 1: Chunking into groups
Instead of memorizing individual digits, group incoming digits into sets of two or three. “4 — 7 — 2 — 9 — 1” becomes “47 — 29 — 1”. This significantly reduces the number of mental units. During the backward recall, you then work through the groups in reverse order—first the last group backwards, then the second-to-last, and so on.
Strategy 2: Silent repetition
Many test-takers report that silent repetition—quietly “repeating” the digits they hear—helps anchor them in working memory. This activates the phonological part of short-term memory and can noticeably improve retention performance for longer sequences.
Strategy 3: Visual Anchoring
Some test-takers visualize the digits they hear as a sort of mental row from left to right—and read them from right to left during entry. This method works particularly well for people with a strong visual memory.
The most important thing: Choose a strategy and stick with it
Try out different approaches during the first few weeks of training — but then decide on a strategy and practice it consistently until the test. If you switch strategies in the middle of the test, you almost always lose several rounds.
How to integrate RMS into your preparation
RMS is one of those modules where regular short sessions are significantly more effective than infrequent long sessions. Working memory improves through consistent training over weeks.
Recommended training structure:
- 10–15 minutes daily — preferably at the same time of day
- In the first 1–2 weeks: Find and stabilize a strategy; automate the reversal step
- Starting in week 3: Targetedly increase sequence lengths, increase input speed
- In the last 2 weeks: Train RMS immediately after another challenging module — this simulates the real test situation after hours of cumulative stress
On DLR-TEST.TRAINING, you train RMS in its authentic format—acoustic number sequences of variable length, backward input, adaptive stage system. After each run, you can see how your accuracy is developing and quickly determine whether your strategy is truly effective.
Go directly to RMS training: app.dlr-test.training →RMS
Train for RMS now
Authentic acoustic format, variable sequence lengths, backward entry — just like in the real test.
Frequently asked questions about the RMS test
Why do I have to enter the numbers backward?
Backward entry isn’t just a random trick—it ensures that you’re actually holding the sequence in your memory and can’t just repeat it sequentially. It tests active mental manipulation of the stored information, not just passive retention.
What happens if I forget the first digits of a long sequence?
You enter what you know—the remaining digits are marked as incorrect. That’s why it’s important to practice strategies that help you retain the initial digits even in long sequences. Chunking is particularly helpful for this.
I always forget after 4–5 digits. Is that normal?
Yes, that’s the typical starting point. Auditory short-term memory has a naturally limited capacity—but this capacity can be measurably expanded through training. With consistent practice over 4–6 weeks, many test-takers report significant improvements.
Does it help to say the numbers out loud?
In the actual test, speaking aloud is not permitted. However, silently repeating the numbers in your head is a proven strategy and fully permitted—and very effective for many test-takers.